JTM 45/100 - Build story

[Strat78]

Great collection so far, the 32/32 RS is to die for! Did you consider block end chassis? This will be my next build as well, so your journal will be closely watched.

[Xplorer]

thanks ! yes, the 32+32 uf would be nice ( but it's an old cap .. ) , for a 7026 dickinson build it would be nice, especialy since i scored some 470 ohms RS 5w wirewound resistors too.

i'll have to make some decisions between the caps. and i'd like to draw a larry grounding layout based on the one of billy batz, for my understanding.

No, it'll be some simple aluminium chassis but ... made after one that supposedly belonged to jimi, and i can believe it, it's the same as the 7026, same "mistakes" , one of the power tubes is placed a bit further from the others. things like that.

anyway, i'll build two ^^

[Xplorer]

List of the pieces
for one JTM45/100 for a start + one other later, + one superlead 69. And later a Sound city 105L/Hiwatt CP103, and a 70' green board JMP restoration.

Hardware

-2 x JTM 45/100 Aluminium chassis
-1 x Superlead 69 chassis
-1 x JTM 45 Front plate
-1 x JTM Black flag front plate
-2 x JTM 45/100 Super amplifier rear plates
-2 x "Super 100 amplifier" decals
-1 x "Super Bad amplifier" decal

-1 x 1204-43 Marstran transformer
-1 x 1202-84 Marstran tansformer
-1 x C1999 4 Henrys choke Marstran
-1 x power transformer screws chassis

-2 x SPST switchs
-2 x Torotor SPST switchs
-1 x set of screws
-1 x set of fuses
-2 x fuse holders ( through the chassis models )
-2 x fuse holders ( inside chassis models )
-3 x Bulgin plugs 3 pins
-3 x vintage selectors
-4 x old style selector plugs
-1 x IEC modern plug
-1 x modern impedance selector
-1 x modern voltage selector
-1 x NOS light indicator
-2 x light indicators
-6 x Scott knobs
-3 x RS perforated paxolin boards
-1 x set of NOS RS turrets
-1 x set of Harwin turrets
-1 x turret skating tool
-12 x cliff jacks

-6 x 1M audio alpha pots
-2 x 5k lin alpha pots
-2 x 25k audio alpha pots
-1 x 25k lin alpha pot
-2 x 250k lin alpha pots
-1 x 250k audio alpha pot

-1 x set of wire
-1 x set of RS lacing cord

Speakers

-2 x Pre rola G12H30 75hz
-1 x Pre rola G12M 55hz
-1 x Pre rola G12M 75hz


Tubes

-4 x Shuegang KT66
-1 x Amperex bugleboy 12AX7
-1 x Telefunken 12AX7
-1 x Tunsgram 12AX7
-2 x Siemens 12AX7

-4 x Power tubes Amphenol sockets
-6 x preamp tubes sockets
-4 x KT66 Mesh holders

Components
Resistors

-2 x sets of piher and carbon comp resistors, measured close to 0% tolerance, except for the carbon comps mostly :

Piher carbon film :

2 x 470 ohms
4 x 820 ohms
4 x 1k5
4 x 5k6
2 x 8k2 1w
2 x 10k 1w
2 x 15k
2 x 27k
2 x 33k
4 x 56k
9 x 68k
2 x 82k
10 x 100k
2 x 150k
6 x 220k
4 x 270k
4 x 470k
8 x 1M

One big stock of piher resistors values. ( i used to sell some complete sets, and now i sell some uncomplete or custom sets once in a while, not really 1 or 2 pieces at a time. )

Allen & Bradley Carbon comp

4 x 820 ohms measured 840,841,845,849 ohms
2 x 8k2 1w measured 8k63 , 8k70
2 x 8k2 2w measured 8k39 , 9k
2 x 10k 1w measured 10k11 , 10k53
2 x 10k 2w measured 10k13 , 10k17
2 x 27k measured 29k , 29k2
2 x 100k measured 108k , 108k1
2 x 56k measured 56k5 , 56k7
2 x 33k measured 34k1 , 34k5

Iskra carbon film

1 x 470ohms measured 471 ohms
2 x 820 ohms measured 818 and 88 ohms
1 x 2k7
1 x 10k measured 10k14
3 x 10k 1w measured 10k11 , 10k24 , 10k28
1 x 15k measured 15k12
1 x 33k measured 33k3
probably 1 x 47k
1 x 82k measured 84k
3 x 100k measured 104k , 104k7 , 102k9 ( 0,75 w ? 1w ? wierd looking ) + 2 x 100k piher
4 x 68k measured 68k8 , 68k6 , 68k9 , 68k9
2 x 220k measured 218k , 219k , shorter leads.
probably 2 x 470k
4 x 1M measured 986k , 995k , 980k , 982k

Metal oxyde resistors

-8 x blue 1w metal oxyde 1 ohm
-8 x grey 1w metal oxyde 1 ohm
-2 x 1k2 ( ?? ) 2w grey metal oxyde

Wirewound resistors

-12 x Welwyn 1k 3w W21
-4 x Welwyn 1k 5w W22
-4 x Ohmite 1k 5w
-4 x Xicon 1k 5w
-4 x NOS RS 470 ohms 5w

Diodes

-7 x miniwatt dario BY114 metal enclosure. i don't have specs on these.
-10 x UF5408

Capacitors

Silver Mica

-1 x RS 560pf ( 500v ? )
-1 x SRC 560pf 500v
-1 x RS 500pf ( 500v ? )
-1 x RS 470pf ( 500v ? )
-several 220pf 500v lemco and RS
-several 250pf SRC ( 350v or 500v ? )
-several lemco 47pf and 50pf

Electrolytics

-8 x Rifa 33uf 400v
-1 x RS 32+32 uf 350v
-1 x 16uf 500v
-2 x Erie 32uf 450vdc

-2 x Rifa 10uf 200vdc
-2 x Sprague Atom 10uf 150vdc
-4 x Blue cap 10uf 160v
-2 x Erie 10uf 150v
-2 x hunts 8uf 150v
-1 x Radiospare 10uf 150v dry electrolytic

-3 x Sprague 250uf 6v
-1 x Erie 250uf 50vdc
-1 x 250uf 16v
-2 x Sprague Atom 250uf 25vdc

Non electrolytic caps

-1 x 0,056uf 450v ac 1000vdc snubber cap
-6 x mullard mustard sets :

JTM45/100 set 1 :
-4 x0,1uf 400v
-5 x 0,022uf 400v

JTM45/100 set 2
-4 x0,1uf 400v
-5 x 0,022uf 400v

Superlead 69 set
-2 x 0,68uf 160v
-2 x Wima 0,68uf 160v
-2 x 0,1uf 400v
-6 x 0,022uf 400v
-1 x 2n2 400v
-1 x Electrolytic blue cap 330uf 25v

70' JMP board
for a restoration. Only have the board with piher and iskras on it + :
-1 x 0,68uf 160v
-1 x 0,68uf 160v Wima
-2 x 0,1uf 400v
-6 x mullard mustard radial 0,022uf 400v ( great for this type of green pcb board )
-1 x 2n2 400v
-1 x Electrolytic Blue cap 330uf 25v

Another JMP board
i might sell this one if it helps for my amp builds. it features somr red wima caps on it, some pihers, + :
some mullard mustard caps, still into tolerance from what i remember :
-1 x 0,68uf 160v
-2 x 0,1uf 400v
-1 x 2n2 400v
-1 x Electrolytic Blue cap 330uf 25v
-10 x piher resistors, to replace those misssing on the board.

Set of mustards and pihers
These are still into tolerance i think, but not close enough of the exact value to me. i might sell it.
-4 x 0,1uf 400v
-2 x 0,022uf 400v
-3 x 2n2 400v
-a nice set of 27 piher resistors

[BoogieEngineer]

I'm curious about the mesh holders as I never come across those. Where did you get yours?

[axeman]

Type china Hats on ebay and they will pop up. from a guy in NYC

[BoogieEngineer]

Type china Hats on ebay and they will pop up. from a guy in NYC

Holy cow $40 a piece I'll pass

[ol foot]

Better hurry only 5 left

http://www.ebay.com/itm/KT66-88-MESH-RE ... 4833dda3ca" onclick="window.open(this.href);return false;

[BoogieEngineer]

Better hurry only 5 left

http://www.ebay.com/itm/KT66-88-MESH-RE ... 4833dda3ca" onclick="window.open(this.href);return false;

Shit some dude just took 4, only 1 left

[Xplorer]

Ask to Sparky, a member here. He may still have some at a decent price, + several other parts for you.

[ol foot]

Better hurry only 5 left

http://www.ebay.com/itm/KT66-88-MESH-RE ... 4833dda3ca" onclick="window.open(this.href);return false;

Shit some dude just took 4, only 1 left

There's more again. China hat works in a search, also tube retainer and mesh retainer etc...
http://www.ebay.com/itm/KT66-88-MESH-RE ... 3f1998584a" onclick="window.open(this.href);return false;

[BoogieEngineer]

Better hurry only 5 left

http://www.ebay.com/itm/KT66-88-MESH-RE ... 4833dda3ca" onclick="window.open(this.href);return false;

Shit some dude just took 4, only 1 left

There's more again. China hat works in a search, also tube retainer and mesh retainer etc...
http://www.ebay.com/itm/KT66-88-MESH-RE ... 3f1998584a" onclick="window.open(this.href);return false;

Yea I got the seller's email this morning that they've got more in stock. Just bought 4 myself

[Xplorer]

Am i missing something, for the particular first JTM45/100 build ?
i'm wondering if i'll use some of these old caps, how to reform them, if it's worth it ..

don't know if i'll go with the 16uf RS or a 33uf Rifa or 32uf Erie, or RS 32+32, for the big cap in the middle of the board ( don't remember the name and its role ) .

same for the 10uf bias caps : sprague atom or rifa ... the Nos erie might go into the superlead build as it's the same on the originals.

for the V1 cathode cap i might go with the sprague 250uf6v : same value as on the original, and esthaeticaly it looks close to the original wima used there.

for the diodes, well .. i don't know, between the germanium shiny BY114 ( i'd have to find some specs on these , cause it's a different brand, not the original mullard BY114 or BY100, though it looks the same )

the carbon comps drifted quite a lot. From what i measured, do you think i should look for another selection of Carbon comps ?

I've been told to use the welwyn 1k 3watts instead of the 5watts, i think i'll go with it.

the snubber cap would be this old red hunts 0,056uf 1000vdc, almost the same model used on the originals. i suppose it's ok with this one ?

i think i'll buy some electrical safety gloves for the testing, i don't feel comfortable to do it again with such voltages involved, without protections.

one amp i'm interested in featured some 470k mixer resistors instead of some 270k, and it didn't have the 560pf bright cap.
it features i think a 220pf tone stack treble cap, and a 56k tone stack resistor. the big cap in the middle is probably a 32uf.

any experiences feedbacks and comments appreciated
Thanks !

List of the pieces
for one JTM45/100 for a start + one other later, + one superlead 69. And later a Sound city 105L/Hiwatt CP103, and a 70' green board JMP restoration.

Hardware

-2 x JTM 45/100 Aluminium chassis
-1 x Superlead 69 chassis
-1 x JTM 45 Front plate
-1 x JTM Black flag front plate
-2 x JTM 45/100 Super amplifier rear plates
-2 x "Super 100 amplifier" decals
-1 x "Super Bad amplifier" decal

-1 x 1204-43 Marstran transformer
-1 x 1202-84 Marstran tansformer
-1 x C1999 4 Henrys choke Marstran
-1 x power transformer screws chassis

-2 x SPST switchs
-2 x Torotor SPST switchs
-1 x set of screws
-1 x set of fuses
-2 x fuse holders ( through the chassis models )
-2 x fuse holders ( inside chassis models )
-3 x Bulgin plugs 3 pins
-1 x IEC modern plug
-1 x modern impedance selector
-1 x modern voltage selector
-4 x old style selector plugs
-2 x light indicators
-6 x Scott knobs
-3 x RS perforated paxolin boards
-1 x set of NOS RS turrets
-1 x set of Harwin turrets
-1 x turret skating tool
-12 x cliff jacks

-6 x 1M audio alpha pots
-2 x 5k lin alpha pots
-2 x 25k audio alpha pots
-1 x 25k lin alpha pot
-2 x 250k lin alpha pots
-1 x 250k audio alpha pot

-1 x set of wire
-1 x set of RS lacing cord

Speakers

-2 x Pre rola G12H30 75hz
-1 x Pre rola G12M 55hz
-1 x Pre rola G12M 75hz


Tubes

-4 x Shuegang KT66
-1 x Amperex bugleboy 12AX7
-1 x Telefunken 12AX7
-1 x Tunsgram 12AX7
-2 x Siemens 12AX7

-4 x Power tubes Amphenol sockets
-6 x preamp tubes sockets
-4 x KT66 Mesh holders

Components
Resistors

-2 x sets of piher and carbon comp resistors, measured close to 0% tolerance, except for the carbon comps mostly :

Piher carbon film :

2 x 470 ohms
4 x 820 ohms
4 x 1k5
4 x 5k6
2 x 8k2 1w
2 x 10k 1w
2 x 15k
2 x 27k
2 x 33k
4 x 56k
9 x 68k
2 x 82k
10 x 100k
2 x 150k
6 x 220k
4 x 270k
4 x 470k
8 x 1M

One big stock of piher resistors values. ( i used to sell some complete sets, and now i sell some uncomplete or custom sets once in a while, not really 1 or 2 pieces at a time. )

Allen & Bradley Carbon comp

4 x 820 ohms measured 840,841,845,849 ohms
2 x 8k2 1w measured 8k63 , 8k70
2 x 8k2 2w measured 8k39 , 9k
2 x 10k 1w measured 10k11 , 10k53
2 x 10k 2w measured 10k13 , 10k17
2 x 27k measured 29k , 29k2
2 x 100k measured 108k , 108k1
2 x 56k measured 56k5 , 56k7
2 x 33k measured 34k1 , 34k5

Iskra carbon film

1 x 470ohms measured 471 ohms
2 x 820 ohms measured 818 and 88 ohms
1 x 2k7
1 x 10k measured 10k14
3 x 10k 1w measured 10k11 , 10k24 , 10k28
1 x 15k measured 15k12
1 x 33k measured 33k3
probably 1 x 47k
1 x 82k measured 84k
3 x 100k measured 104k , 104k7 , 102k9 ( 0,75 w ? 1w ? wierd looking ) + 2 x 100k piher
4 x 68k measured 68k8 , 68k6 , 68k9 , 68k9
2 x 220k measured 218k , 219k , shorter leads.
probably 2 x 470k
4 x 1M measured 986k , 995k , 980k , 982k

Metal oxyde resistors

-8 x blue 1w metal oxyde 1 ohm
-8 x grey 1w metal oxyde 1 ohm
-2 x 1k2 ( ?? ) 2w grey metal oxyde

Wirewound resistors

-12 x Welwyn 1k 3w W21
-4 x Welwyn 1k 5w W22
-4 x Ohmite 1k 5w
-4 x Xicon 1k 5w
-4 x NOS RS 470 ohms 5w

Diodes

-7 x miniwatt dario BY114 metal enclosure. i don't have specs on these.
-10 x UF5408

Capacitors

Silver Mica

-1 x RS 560pf ( 500v ? )
-1 x SRC 560pf 500v
-1 x RS 500pf ( 500v ? )
-1 x RS 470pf ( 500v ? )
-several 220pf 500v lemco and RS
-several 250pf SRC ( 350v or 500v ? )
-several lemco 47pf and 50pf

Electrolytics

-8 x Rifa 33uf 400v
-1 x RS 32+32 uf 350v
-1 x 16uf 500v
-2 x Erie 32uf 450vdc

-2 x Rifa 10uf 200vdc
-2 x Sprague Atom 10uf 150vdc
-4 x Blue cap 10uf 160v
-2 x Erie 10uf 150v
-2 x hunts 8uf 150v
-1 x Radiospare 10uf 150v dry electrolytic

-3 x Sprague 250uf 6v
-1 x Erie 250uf 50vdc
-1 x 250uf 16v
-2 x Sprague Atom 250uf 25vdc

Non electrolytic caps

-1 x 0,056uf 450v ac 1000vdc snubber cap
-6 x mullard mustard sets :

JTM45/100 set 1 :
-4 x0,1uf 400v
-5 x 0,022uf 400v

JTM45/100 set 2
-4 x0,1uf 400v
-5 x 0,022uf 400v

Superlead 69 set
-2 x 0,68uf 160v
-2 x Wima 0,68uf 160v
-2 x 0,1uf 400v
-6 x 0,022uf 400v
-1 x 2n2 400v
-1 x Electrolytic blue cap 330uf 25v

70' JMP board
for a restoration. Only have the board with piher and iskras on it + :
-1 x 0,68uf 160v
-1 x 0,68uf 160v Wima
-2 x 0,1uf 400v
-6 x mullard mustard radial 0,022uf 400v ( great for this type of green pcb board )
-1 x 2n2 400v
-1 x Electrolytic Blue cap 330uf 25v

Another JMP board
i might sell this one if it helps for my amp builds. it features somr red wima caps on it, some pihers, + :
some mullard mustard caps, still into tolerance from what i remember :
-1 x 0,68uf 160v
-2 x 0,1uf 400v
-1 x 2n2 400v
-1 x Electrolytic Blue cap 330uf 25v
-10 x piher resistors, to replace those misssing on the board.

Set of mustards and pihers
These are still into tolerance i think, but not close enough of the exact value to me. i might sell it.
-4 x 0,1uf 400v
-2 x 0,022uf 400v
-3 x 2n2 400v
-a nice set of 27 piher resistors

[VintageCharlie]

whoa! nice start, Xplorer! Looking forward to the build and pics.

[Xplorer]

Thanks Karlis ! your post on metro a year or two ago was a part of this start too !

some more pieces. getting closer ....
old selectors - RS wirewound resistors 470 ohms 5 watts. perhaps for some kind of 7026 build.

[Xplorer]

some Siemens tubes - a nos light indicator