Tremolo 50w service

Marshall Amp Discussion

Moderators: pompeiisneaks, Colossal

User avatar
M Fowler
Posts: 14017
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Tremolo 50w service

Post by M Fowler »

Servicing a Marshall Tremolo 50w pretty much original a few things have been worked on. Power cord is completely crumbling in my hands. One wire on standby switch is undone. Pilot light broke.

Fun amp for me to bring back to life.
20221209_075455.jpg
20221209_075500.jpg
20221209_075506.jpg
20221209_075543.jpg
20221209_075556.jpg
You do not have the required permissions to view the files attached to this post.
sluckey
Posts: 3079
Joined: Sun Jul 22, 2007 7:48 pm
Location: Mobile, AL
Contact:

Re: Tremolo 50w service

Post by sluckey »

Looks like a Billy Gibbons hat on those power tubes. :wink:
User avatar
M Fowler
Posts: 14017
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: Tremolo 50w service

Post by M Fowler »

I have 4 NOS caps to use in my SL100 Marshall clone build.
User avatar
Reeltarded
Posts: 9955
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: Tremolo 50w service

Post by Reeltarded »

oh it wants me to strip it and make it scream!! look at it flirting at me with that 7 inches from sensible 4th noval.

i'm a killer. that one looks pretty good!

hmmmmm shared, drilled board.. 10333... .1u.. pancake mix bypass.. 1968.

It is even a BB. Which cabinet did it come in? Does it have a valance or just cloth front?
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
User avatar
Reeltarded
Posts: 9955
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: Tremolo 50w service

Post by Reeltarded »

Calling Roe. Come in, Roe. beee bedee dee deee deee de dee deee dee
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
User avatar
M Fowler
Posts: 14017
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: Tremolo 50w service

Post by M Fowler »

Small box head with valance.
User avatar
bepone
Posts: 1583
Joined: Mon Mar 09, 2009 4:22 pm
Location: croatia
Contact:

Re: Tremolo 50w service

Post by bepone »

Full iskra resistors inside :wink: ! Ex Yugoslavia, we were producing everything. Now it is only part of history. Looks like PI resistor 470R has been replaced for CC
User avatar
Reeltarded
Posts: 9955
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: Tremolo 50w service

Post by Reeltarded »

M Fowler wrote: Sat Dec 10, 2022 6:42 pm Small box head with valance.
:?

Has combo lip
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
Roe
Posts: 1650
Joined: Thu May 31, 2007 2:10 pm

Re: Tremolo 50w service

Post by Roe »

Reeltarded wrote: Fri Dec 09, 2022 4:05 pm oh it wants me to strip it and make it scream!! look at it flirting at me with that 7 inches from sensible 4th noval.

i'm a killer. that one looks pretty good!

hmmmmm shared, drilled board.. 10333... .1u.. pancake mix bypass.. 1968.

It is even a BB. Which cabinet did it come in? Does it have a valance or just cloth front?
the 50w tremolos used the bass circuit, while theh 100w tremolos (supertremolos) used the lead circuit. So .1uf does not indicate 1968
www.myspace.com/20bonesband
www.myspace.com/prostitutes
Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
4x12" w/H75s
User avatar
Reeltarded
Posts: 9955
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: Tremolo 50w service

Post by Reeltarded »

Ahh I mean the pres and I meant Mustard .1. Earlier amp is different and later amps end up with mixed brand caps. I used the serial range to predict production above my JTM50. Look at the bias trimmer. I think it's mid 68 and lost it's head hutch.

It has a combo lip. Somewhere, there is a sad lonely and expensive cabinet remnant under a bunch of rotting food waste and ink stained Barbie heads.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
pdf64
Posts: 2703
Joined: Sat Mar 12, 2011 9:23 pm
Location: Staffordshire, UK

Re: Tremolo 50w service

Post by pdf64 »

M Fowler wrote: Fri Dec 09, 2022 2:05 pm Servicing a Marshall Tremolo 50w …
Would you mind measuring the resistance of the HT winding? ie from the PT winding lug with anode of one rectifier diode to the anode of the diode on the other lug.
TIA.
User avatar
M Fowler
Posts: 14017
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: Tremolo 50w service

Post by M Fowler »

Sure I can measure.

It has a beat up 4x12 cab.
received_1149438045690019.jpeg
received_1583107318800249.jpeg
received_898849048083531.jpeg
You do not have the required permissions to view the files attached to this post.
User avatar
M Fowler
Posts: 14017
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: Tremolo 50w service

Post by M Fowler »

pdf64 wrote: Thu Dec 15, 2022 3:06 pm
M Fowler wrote: Fri Dec 09, 2022 2:05 pm Servicing a Marshall Tremolo 50w …
Would you mind measuring the resistance of the HT winding? ie from the PT winding lug with anode of one rectifier diode to the anode of the diode on the other lug.
TIA.
It reads 77.4 ohms

From diode to ct 39.6 and 37.6 other side.

Plate voltage 421vdc
Last edited by M Fowler on Tue Dec 20, 2022 7:21 pm, edited 2 times in total.
User avatar
M Fowler
Posts: 14017
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: Tremolo 50w service

Post by M Fowler »

Head cab. Myles is that your paint work?
20221220_122803.jpg
20221220_122729.jpg
You do not have the required permissions to view the files attached to this post.
User avatar
Reeltarded
Posts: 9955
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: Tremolo 50w service

Post by Reeltarded »

wow I LOVE THAT

It appears to have combo mounting holes for the front lip. I have only ever seen two heads done that way but maybe 10 heads with the lip.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
Post Reply