diytube Stereo 35 Instructions For Assembly Operation

diytube

stereo 35 power amplifier

rev d

INSTRUCTIONS FOR

ASSEMBLY

OPERATION

Price $10.00

Disclaimer

Undernocircumstancesdoesdiytubeassumeliabilityorresponsibilityforinjury

ordamagessustainedintheassembly,testoroperationofthiskitorfordamages

toanyotherequipmentconnectedtoit.Asthisisapartialkit,properassemblyis

buyer’sresponsibility.diytubereservestherighttomake

designchangesor

improvementswithouttheobligationtorevisepriorversions.Allspecifications

aresubjecttochangewithoutnotice.



• WARNING:Lethalvoltages(greaterthan400VDC)arepresentinthis

project.

• UseaVariacorisolationtransformerwhileworkingonandtestingthe

unit.

• Usearubbermat

tostandonwhileworkingonandtestingtheunit.

• KeeponehandinyourbackpocketifprobingvoltageswithaDMM.

• Wrapasmallpieceofelectricaltapearoundthetestleadprobeshaftto

exposejustthetip.

• Donotconnectordisconnectwirestotheterminalblockswhenunitis

poweredorpluggedin.

• Lethalvoltagesexistinthecapacitorsevenafterunitispowereddown,so

waitatleastonehourtoafterunpluggingtoallowchargetodissipate.



Warranty Information

Allgoodspurchasedfromdiytubehaveathirty(30)daywarrantyfromthedate

ofpurchaseagainstdefects.



Istronglysuggestyoucompletelyreadthismanualbefore

youturnonyourironorgetoutthecuttingoil.



Preparation

Beforeassembly,somepreparationneedstodone.Partsmustbepurchased,a

workareaneedssetupandchassisdecisionsshouldbemade.Theaxiomhaste

makeswastehasneverbeenmoretrue.Makesureyourchosentransformersand

theboardwillfitcomfortablyusingthechassisofyourchoice.ThePCBitself

makesaperfecttemplate,asshownonthewebsite,forsocketandmounting

holes.BesuretoplanwhereRCAconnectors,bindingposts,standby&ON/OFF

switchesandtheACcordwillbeorientedonthechassis.Physicallylayoutthe

partsinaspaceequaltoyourchassistoassureeverythingfits.Also,notethatthe

vacuumtubesocketscanonlybemountedononeside,whichisdesignatedin

thesilkscreen.



Overview of the Schematic and Design

ThedesigncloselyresemblestheDynacoStereo35.Theuseofone12DW7per

channelhasbeenreplacedby½a12AX7Aand½a12AU7.The12AX7Aisa

voltageamplifierthatdirectlydrivesthe12AU7,acathodynephasesplitter.The

onlyothermeaningfulchangeisthereplacementofasinglecathoderesistorand

capacitorwithfourindividualresistorsandcapacitors.Alargervalueresistorin

serieswithavariableresistorparallelsthemaincathoderesistor,providinga

rangeof320‐450ohmspercathode.Thiscircuitistheninserieswitha10ohm

resistortocalculatethecurrentveryeasilyviaatestpoint‐setconservativelyfor

350mV,thus35mA.



Using the Assembly Drawing

Theassemblydrawingisaquickreferencetowhatcomponentiswhereandthe

numberingschemefortheconnectors.Itisalsoagoodplacetomakeanynotes.



Soldering

ThisPCBisadouble‐sided,platedthrough‐holedesignon

.094”FR4material

withLPI(liquidphoto‐imagable)soldermaskand2ouncecopperperside.

Whensolderingthesecomponents,letthesolderflowthroughtheholetoforma

‘teepee’onbothsidesoftheboardforanoptimumconnection.Groundplane

connectionssinkalotofheatfromthe

solderingiron,sotakecaretodothese

well‐youmayhavetotouchupfromtheoppositeside.



TIP:PCBStuffing

Usetheflatendofthe10‐poleterminalblockasaleadbendingtool.This

worksformostoftheparts.Dotakecaretonotdamagethemeniscusofthe

components.Insertallresistorsbeforesoldering,bendingtheleadsdowntohold

theminplace.Thisallowsonetofixanyplac ingerrors thatmightoccurvery

easily.Useagoodpairofsnipstoremovetheexcessleads.Thetopsideofthe

PCBisdesignatedasthesidewiththegroundplaneandwiththesockets

markedas‘THISSIDEONLY’.



1. StuffallfixedvalueresistorsintothePCB.MountR36andR34onthe

oppositesideofthePCB(i.e.oppositeofR37andR35).Thisisto

maximizeheatdissipation.

2. Stuffvariableresistors.Youmaychoosetoputthemonthetopsideofthe

PCBanddrillextraholesinyourchassisforexternaladjustments.There

areguidesholeinthePCBforthis.Also,besureyouwillcaneasilyinsert

aDMMprobebetweentheresistors.

3. Kinkleadsonthesilvermicacapacitorsandstuff.

4. StuffD1andD2.Mindtheorientationofthecathode,whichisrepresented

byastripeonboththesilkscreenandthediode’sbody.

5. StuffC5,C6,C7&C8.Mindthepolarity.Theboardhas“+”symbolsto

showwherethepositiveterminalfromthecapacitorshouldbeplaced.

Notethatmanymoderncapshaveonlythe“‐“terminalmarked,usually

withastriperunningdownoneside.Ifyouchoosetosubstitute,the

diametermustbenomorethan10mm.Useasmallervalue,forexample

100uF,ifnecessary.

6. Stuffallthepolypropcapacitors.

7. Placeandsolderallthetubesockets–makesurethey

aremountedonthe

topsideonly.Itisrecommendedtouseanoldminiatureninepintubeto

breakinthesockets.Ihavefoundaverysmallnailworkswellforme–

butdon’tbreaktheceramic!

8. Placeandsoldertheterminalblocks.Donotover

soldertheconnectorsas

soldercouldthenspillundertheconnectorcausingashort.

9. StuffR42,theIRCL,makingsureitdoesn’tleanonortouchtheJ1

terminalblockasitgetswarm.

10. Stuffthe4filtercapacitors.Mindthepolarity.Ifthesearesubstituted,the

diametermustbe25mmorless.Theheightmustbe30mmorlesstofitin

a2”highchassis.

11. Carefullygooveryourwork,lookingfor:

a. anycoldsolderjoints(thesewilllookdull)

b. soldersplashesandshortsbetweensocketpins

c. anyconnectionsthatsolderdidn’tflowtotheotherside(like

groundplaneconnections)

d. snipexcessleads

e. compareyourboardtophotosfrom thewebsite–agoodcheckfor

capacitororientation



Initial Impedances: When it Doubt, Ohm it Out

Thesearewithoutconnectionstotheterminalblocks.Whenconnected,those

readingsthatwilldifferwillbeinbrackets.Differenttransformerswillhave

differentreadings–thisoneisaPA‐774.



J1

1. >2M  [94]

2. >2M [94]

3. >200K

4. >200K

5. GND

6. GND

7. 100 [50]

8. 100 [50]

9. >10M

10. >10M

J2

1. >10M

2. >10M

3. GND

J3

1. >10M

2. >10M

3. 28.3K  [1ohm]

J4

1. >10M

2. >10M

3. 28.3K  [1ohm]

J5

1. >10M

2. >10M

3. GND

J6

1. >10M

2. GND

J7

1. >10M

2. GND



Initial Settings: Feedback and Bias



WARNING:Dotheseadjustmentswiththeunitoffandunplugged,as

wellashavinghadonehourtobleedvoltagefromthefiltercaps.



Note:Mostampswilljustuseafixedresistorhere,butthediytubecircuit

usesapotforexperimentationssake‐thusthisextrastep.



1)Donʹthaveyournegativefeedbackconnectedyet,thatisyouroutput

secondaryorelseitwillbeareallowimpedance.

2)ProbeyourDMMfromJ4pin3(rightchannel)togroundandadjustR30

untiltheresistanceis20.3K(setto28.3Kifusingthe16ohmtapasfeedback,

asintheoriginalZ565).

3)ProbeyourDMMfromJ3pin3(leftchannel)togroundandadjustR31

untiltheresistanceis20.3K(setto28.3Kifusingthe16ohmtapasfeedback,

asintheoriginalZ565).

4)Yourfeedbackisset.



Adjusting Bias



1)Withtheunitoff,probeyourDMMfromV3pin3(thecathode)toground.

AdjustR22untilyoumeasure400ohmstoground.



2)ThenprobeyourDMMfromV4pin3(thecathode)toground.AdjustR19

untilyoumeasure400ohmstoground.

3)ThenprobeyourDMMfromV5pin3(thecathode)toground.AdjustR28

untilyoumeasure400ohmstoground.

4)ThenprobeyourDMMfrom

V6pin3(thecathode)toground.AdjustR25

untilyoumeasure400ohmstoground.



WARNING:ThefollowingisdonewhiletheunitisONandIDLE.Take

careandfollowproperhighvoltagesafetyrules.



5)Withallyourconnectionsinplace,powerup.Yourinitialbiashasbeenset

‐thismakessurethatyoudonʹtaccidentallyhaveatubeaggressivelybiased,

andtheyshouldallendupnearthesamerangeonpowerup.

6)ProbeyourDMM(settoDCvolts)fromthetestpointwhichissandwiched

betweentheR19&R22toground.V3isadjustedwiththeʹinsideʹtestpoint.

AdjustR22untilthevoltageis.350Vor350mV.

7)ProbeyourDMM(settoDCvolts)fromthetestpointwhichissandwiched

betweentheR19&R22toground.V4isadjustedwiththeʹoutsideʹtestpoint.

AdjustR19untilthevoltageis.350Vor350mV.

8)ProbeyourDMM(settoDCvolts)fromthetestpointwhichis

sandwichedbetweentheR25&R28toground.V5isadjustedwiththeʹinsideʹ

testpoint.AdjustR28untilthevoltageis.350Vor350mV.

9)ProbeyourDMM(settoDCvolts)fromthetestpointwhichissandwiched

betweentheR25&R28toground.V6isadjustedwiththeʹoutsideʹtestpoint.

AdjustR25untilthevoltageis.350Vor350mV.



Voltages



Thesearezero‐signal,nominalmeasurementsinVDC,unlessotherwise

noted.Theyareallreferencedtoground.



PIN V1 V2 V3 V4 V5 V6

1 116 207‐‐‐‐

2 0 116 0 0 0 0

3 780mV 120 13 13 13 13

4 3.1VAC 3.1VAC 3.1VAC 3.1VAC 3.1VAC 3.1VAC

5 3.1VAC 3.1VAC 3.1VAC 3.1VAC 3.1VAC 3.1VAC

6 115 208‐‐‐‐

7 0 114 360 360 360 360

8 780mV 118‐‐‐‐

9 3.1VAC 3.1VAC 364 364 364 364

Modifications

• Ifvolumecontrolsaredesired,usea100korbetteraudiotaperpot.

Alinearpotwillnotworkcorrectly.Youcansalvagethe250kpot

offofyourDynacoSCA‐35.RadioShackhasa100kAlpsstereopot

thatmanypeopleuse.Eachchannelmusthaveitsowncontrol,so

eitherastereopotortwosinglepotsmustbeused.

Thepotconnectionswillbe:

‐pin1toRCAaudioIN

‐pin2(thewiper)toJ6‐1orJ7‐1(dependingon

channel)

‐pin3toJ6‐2(GND)orJ7‐2(GND)

Todeterminewhichpiniswhich,useaDMMandcrankthe

volumepotfullycounter‐clockwise(lowestvolumesetting).

Resistancebetweenpins1&2willbenearlythefullrangeofthe

pot.Pins2&3willbeverylowresistance.Rotatingthepotfully

clockwise(highestvolumesetting)willyieldoppositeresults,i.e.

pins1&2willbeverylowresistanceandpins2&3willbenearly

thefullrangeofthepot.Ifusingastereopot,followthesame

processwithpins4,5&6.

• A100ohm1Wresistor(Mouser#281‐100)canbesolderedonthe

undersideoftheboardbetweenpins1&2onJ2,J3,J4andJ5for

triodeoperation.DonotattachanyULtapstopin2onthese

connectorblocksifyoudothis.DonotpopulateC20& C21.

• Ifyouareusingafilamentsupplywithacentertapandchooseto

usethecentertap,donotpopulateR40and41.Thesearefornon‐

CTfilamentsupplies,suchastheDynacoPA‐774.

• SW2canbeomittedandthesecondaryCTwiredstraighttoground

ifastandbyswitch

isnotdesired.

• R42,theIRCL,isveryimportantforproperoperationofthisunit.It

ispossibletowireaswitchinparallelwithitinordertakeitoutof

thecircuitoncetheunithaswarmedup,butthisisnot

recommended‐especiallyforHammonds,astheyareratedat

115VAC.Note:ThiswillincreasetheB+byaround12Vandwill

slightlyincreaseheatervoltage.Switchwouldneedtoberesetas

well.

• A.05uF,1kVceramiccapmaystraptheON/OFFswitch(pins1and

2).Thiscanprevent‘pops’onturnoff.

• Afootprintforatwo‐poleconnectorislocatedoverR34&R35

whichisforthosewishingtouseachoke.

diytube Stereo 35 Rev D Revised: November 30, 2008

Tip: Put a dot in the checkbox if you have the part already as a quick

reference when ordering parts. ‘X’ out the checkbox when you have installed the

part on the PCB.

Item QTY Reference Part Mouser Part Unit Cost

_________________________________________________________________________

 2 R1,R2 47K, 1/2W 71-RN65D-F-47.5K 0.31

 6 R3,R4,R13,R14, 470K, 1/4W 71-RN60D-F-475K 0.24

R15,R16

 2 R5,R6 1.3K, 1/2W 71-RN65D-F-1.27K 0.31

 2 R7,R8 300K, 1/2W 71-RN65D-F-301K 0.31

 2 R9,R10 27K, 1W 281-27K-RC 0.13

 2 R11,R12 33K, 1W 281-33K-RC 0.13

 4 R17,R20,R23,R26 470, 3W 71-CW2B-470 0.64

 4 R18,R21,R24,R27 1K, 1/2W 71-RN65D-F-1.0K 0.31

 4 R19,R22,R25,R28 10K Pot 72-T93YB-10K 1.32

 1 R29 300K, 1W 594-5083NW330K0J 0.32

 2 R30,R31 100K Pot 72-T93YB-100K 1.44

 2 R32,R33 3.3K, 3W 72-RWM410-3K3-5 0.51

 4 R34,R35,R40,R41 100, 3W 72-RWM410-100-5 0.48

 2 R36,R37 Jumper Use cut leads 0.00

 2 R38,R39 150K, 1/2W 71-RN65D-F-150K 0.31

 1 R42 Inrush Limiter 527-CL90 1.72

 4 R43,R44,R45,R46 10 Ohm, 1/4W 71-RN60D-F-10 0.09

 4 C1,C2,C3,C4 0.1uF,400V 75-715P400V0.1 1.63

 4 C5,C6,C7,C8 470uF,35V 140-XRL35V470-RC 0.25

 4 C9,C10,C11,C12 120uF,450V 5985-380-450V121 3.10

 2 C16,C17 27pF 5982-15-500V27 0.68

 2 C18,C19 33pF 5982-15-500V33 0.68

 2 C20,C21 15pF 5982-15-500V15 0.66

 2 C22,C23 0.22uF 5989-250V.22-F 0.58

 2 D1,D2 UF4007 Diode 625-UF4007-E3 0.18

 1 J1 10pin .375” Block 571-114376644 2.46

 4 J2,J3,J4,J5 3pin .375” Block 571-14376645 0.82

 2 J6,J7 2pin .375” Block 571-14376644 0.64

diytube Stereo 35 Rev D Revised: November 30, 2008

Item QTY Reference Part Mouser Part Unit Cost

_________________________________________________________________________

Note: Change the last letter of the part number, ‘G’, to a ‘Y’ or ‘R’ for a

yellow or red neon indicator on the power switch. Default is green.

 1 SW1 Power Switch 103-R13-112B-02G-EV 1.35

 1 SW2 Standby Switch 103-R13-112A-02-EV 0.99

 1 F1 Fuse Holder 504-HTB-26M 2.88

 1 F1 2A Midget Fuse 504-GMA-2 0.28

 1 3-Prong AC cord 173-53101-E 3.59

 1 Strain Relief 561-MP5N4 0.13

 1 Stereo Volume Pot 313-2420F-100K 2.73

 1 12X8X2 Chassis 546-1444-22 25.18

 1 12X8 Bottom 546-1434-22 11.08

 1 12X10X2 Chassis 546-1444-29 26.02

 1 12X10 Bottom 546-1434-29 11.08

Note: Due to the small quantities of nuts & bolts, you might want to buy these

at your local hardware store. The Mouser parts are nickel plated and in boxes

of 100. Don’t forget solder, spade connectors, etc.

 1 RCA Red Jack 161-0251-EX 0.87

 1 RCA Black Jack 161-0252-EX 0.87

 4 Binding Posts 164-4205 2.06

 2 Binding Posts 164-4201 2.06

 2 Red Test Points 151-307-RC 0.30

 2 White Test Points 151-301-RC 0.30

 8 Standoffs 1/4X1/2 534-1451C 0.52

 6 Bushings 534-744 0.51

 1 box (need 16) 6-32x1/4 screws 5721-632-1/4SS 5.40

 1 box (need 8) #6 lock washers 5721-LWI6SS 4.95

 1 box (need 12) 10-32x3/8 screws 5721-1032-3/8 5.43

 1 box (need 12) #10 flat washers 538-MW-404C 2.36

 1 box (need 12) #10 lock washers 5721-LWI-10-SS 5.85

 1 box (need 12) 10-32 hex nuts 5721-1032-SS 7.07

diytube Stereo 35 Rev D Revised: November 30, 2008

Item QTY Reference Part Mouser Part Unit Cost

_________________________________________________________________________

Note: I’m assuming this is the area people will improvise most, and with parts they have

on hand. I highly recommend parting out a Dynaco SCA-35 as these are the same

transformers found the in the highly regarded Dynaco ST-35.

 1 V1 12AX7 varieties

 1 V2 12AU7 varieties

 4 V3,V4,V5,V6 6BQ5/EL84/7189/6p14p

 6 V1-V6 9pin PCB Ceramic Socket

 1 T1 Dynaco PA-774 Power Transformer

 1 T1 Hammond 270HX Power Transformer

 2 T2,T3 Dynaco Z-565 Output Transformer (8 & 16 ohm)

 2 T2,T3 Triode Electronics 4 & 8 ohm Z-565 Output

 2 T2,T3 Hammond 1650F Output Transformer

Note: Hammond 1650E (8k) and 1620 (6.6k) have been used as well.

Triode Electronics -- http://www.triodeelectronics.com/

Angela Instruments -- http://www.angela.com/

Antique Electronics -- http://www.tubesandmore.com/

Handmade Electronics -- http://www.hndme.com/

Triode Electronics Angela Instruments Antique Electronics Handmade Electronics

Dynaclone PA774 $64.95 Hammond 270HX $73.00 Hammond 270HX $73.05 Hammond 270HX $69.31

Dynaclone Z565 $69.95 Hammond 1650FA $105.00 Hammond 1650F $55.22 Hammond 1650F $66.70

9pin Ceramic PC $2.35 EL84 Quad $60.00 9pin Ceramic PC $2.50 9pin Ceramic PC $1.25

Sovtek EL84 quad $37.95 6189W JAN $15.00 EI EL84 quad $31.80 Sovtek EL84 quad $36.00

12AX7 $9.95 Hammond Chassis Stocked 12AX7 $6.95 12AX7 $7.95

12AU7 $9.95 12AU7 $4.75 12AU7 $5.95

Hammond Chassis Stocked

4 4

3 3

2 2

1 1

NF left

NF right

NF left

NF right

PF right

PF left

PF right

6.3VAC B

6.3VAC B6.3VAC A

6.3VAC B6.3VAC B

6.3VAC B 6.3VAC B

320V

6.3VAC A

J3 Output Transformer Hookup

R31

100k

1 3

J2 Output Transformer Hookup

R10 27K

300K

R9 27K

R38

150K

C22

0.22uF

R12 33K

R39

150k

C2 0.1uF

R14

470K

R17

470

R43

R20

470

470uF

R44

C20

15pF

C17

27pF

J7 Left Channel Input

C23

0.22uF

V5 EL84

h''

i/c

i/c''

i/c'''

V6 EL84

h''

i/c

i/c''

i/c'''

C4 0.1uF

J4 Output Transformer Hookup

R16

470K

R23

470

C21 15pF

0.1uF

J5 Output Transformer Hookup

R27

R24

R28

10K

R15

470K

R26

470

R46

R25

10K

470uF

C16

27pF

R30

100k

V3 EL84

h''

i/c

i/c''

i/c'''

R19

10K

R18

R21

R22

10K

J6 Right Channel Input

R4 470K

1.3K

C19 33pF

R7 300K

12AU7

2 7

h''

g'' g

k''

a''

R11 33K

R5 1.3K

12AX7

2 7

h''

g'' g

k''

a''

470K

47K

C18 33pF

R13

470K

C1 0.1uF

R45

470uF

V4 EL84

h''

i/c

i/c''

i/c'''

47K

4 4

3 3

2 2

1 1

{Doc} B

Stereo 35 Power Supply

4 4Sunday, May 16, 2004

Title

Size Document Number Rev

Date: Sheet

320V

6.3VAC A

6.3VAC B

R42

Keystone CL-90

C12

120uF

C10

120uF

C11

120uF

R35

100, 3W

D1 UF4007

D2 UF4007

CON10

R37

.05, 3W ww

R36

.05, 3W ww

R33

3.3K, 1W

R32

3.3K, 1W

R41

100

R40

100

R34

100, 3W

120uF

R29

300K

4 4

3 3

2 2

1 1

Spare Ground

PA-774

Logical Layout of the diytube Stereo 35

with Dynaco Transformers

red

blue

green

green/white

blue/white

yellow

orange

black

orange

black

yellowblue

green

red

blue/white

green/white

Z-565

120VAC

black

brown

brown/white

green/white

green

red

red/yellow

red

SW1:

Connect pin 1 to the fuse,

pin 2 to the primary and pin 3 to

J1-10, as the neon bulb is in

parallel to the primary winding.

green

white black

diytube

Stereo 35

PCB

Rev D

Connect directly to chassis. Signal ground floats, but

should be strapped to earth ground during testing.

Right Channel

Left Output Transformer

Left Channel

16 OHM

Right Output Transformer

SW1

16 OHM

Power Transformer

GND

8 OHM

GND

4 4

3 3

2 2

1 1

Spare Ground

Hammond 270HX

Logical Layout of the diytube Stereo 35

with Hammond Transformers

red

blue

blu/yel

brn/yel

brown yellow

blk/yel

black

blackblue

blu/yel

red

brown

brn/yel

Hammond Style

120VAC

black

green

red

red/yel

red

SW1:

Connect pin 1 to the fuse,

pin 2 to the primary and pin 3 to

J1-10, as the neon bulb is in

parallel to the primary winding.

green

white black

diytube

Stereo 35

PCB

Rev D

green

grn/yel

green

blk/yel

grn/yel

yellow

Just think green/yellow to green, and

black/yellow to black.

grn/yel

Connect directly to chassis. Signal ground floats, but

should be strapped to earth ground during testing.

GND

Left Output Transformer

Right Output Transformer

Left Channel

Power Transformer

4 OHM

GND

8 OHM

SW1

4 OHM

Right Channel

8 OHM

4 4

3 3

2 2

1 1

320V

6.3VAC A

6.3VAC B

Title

Size Document Number Rev

Date: Sheet

<Doc> B

Stereo 35 Power Supply

44Sunday, November 30, 2008

R33

3.3K, 1W

R36

jumper

R37

jumper

JP1 JUMPER

C10

120uF

33uF

JP2 JUMPER

C11

120uF

C12

120uF

R32

3.3K, 1W

J7 Choke

R41

100

R40

100

CON10

R42

Keystone CL-90

R29

300K

4 4

3 3

2 2

1 1

Spare Ground

Hammond 372HX 600VCT

Logical Layout of the diytube Stereo 35

with Hammond Transformers

red

blue

blu/yel

brn/yel

brown yellow

blk/yel

black

blackblue

blu/yel

red

brown

brn/yel

Hammond Style

120VAC

black

green

red

red/yel

red

SW1:

Connect pin 1 to the fuse,

pin 2 to the primary and pin 3 to

J1-10, as the neon bulb is in

parallel to the primary winding.

green

white black

diytube

Stereo 35

PCB

Rev D

green

grn/yel

green

blk/yel

grn/yel

yellow

Just think green/yellow to green, and

black/yellow to black.

grn/yel

Connect directly to chassis. Signal ground floats, but

should be strapped to earth ground during testing.

yellow

yel/blk

Left Output Transformer

GND

8 OHM

GND

Power Transformer

4 OHM

8 OHM

Right Output Transformer

4 OHM

Left Channel

Right Channel

SW1

5AR4

4 4

3 3

2 2

1 1

320V

6.3VAC A

6.3VAC B

Title

Size Document Number Rev

Date: Sheet

<Doc> B

Stereo 35 Power Supply

44Sunday, November 30, 2008

R33

3.3K, 1W

R36

jumper

R37

jumper

JP1 JUMPER

C10

120uF

33uF

JP2 JUMPER

C11

120uF

C12

120uF

R32

3.3K, 1W

J7 Choke

R41

100

R40

100

CON10

R42

Keystone CL-90

R29

300K

9.250

4.250

1.000

0.156

0.640

3.650

1.500

0.300

0.550

1.750

4.625

3.4801.260

diytube Stereo 35 Instructions For Assembly Operation

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