Vintage JTM-50 - S/11295 - 1968 - what it it worth? How to rennovate (if at all)

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
marshall amp pics 003.jpg marshall amp pics 006 copy.jpg

Dear All,

I have an old Marshall 50W amp that I havent played for many many years. I am a bit afraid to power it up ..... also needs the burgin connector updating.

Do you have any idea what it may be worth?

If I replace the burgin connector will it loose its value?

Also, would a referb of the casing and knobs add value (or decrease its value)?

Many thanks for any suggestions or ideas you may have.

Thanks - Red
 
Last edited:

kuli

Active Member
Joined
May 10, 2011
Messages
203
Reaction score
135
Welcome to the forum!
Nice amp!
Don't change anything, if you are looking to sell, let the buyer change these things.
And we need to see some inside pictures, including removing the amp from the head and show us the insides.
 

neikeel

Well-Known Member
Joined
Feb 12, 2014
Messages
6,994
Reaction score
6,317
Yep, pictures - lots of them
It is Bulgin btw - and leave it alone - for now!
 

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
marshal small.jpg 20210407_122550.jpg 20210407_122626.jpg 20210407_123054.jpg 20210407_123134.jpg 20210407_123209.jpg 20210407_123229.jpg 20210407_123245.jpg 20210407_123400.jpg 20210407_123414.jpg
View attachment 87542 View attachment 87543 View attachment 87543 View attachment 87542 View attachment 87543 Dear All,

I have an old Marchal 50W amp that I havent played for many many years. I am a bit afraid to power it up ..... also needs the burgin connector updating.

Do you have any idea what it may be worth?

If I replace the burgin connector will it loose its value?

Also, would a referb of the casing and knobs add value (or decrease its value)?

Many thanks for any suggestions or ideas you may have.

Thanks - Red
 
Last edited:

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
20210407_123430.jpg 20210407_123655.jpg 20210407_123732.jpg 20210407_123745.jpg 20210407_123430.jpg 20210407_123655.jpg 20210407_123732.jpg 20210407_123745.jpg 20210407_123430.jpg 20210407_123655.jpg 20210407_123732.jpg 20210407_123745.jpg some more pics from this morning .... probably hasnt seen the light of day for 50 years.

trying to make out the id of the signatute on the inspection label ..... I dont think its Rosemary .... any clues?
 
Last edited:

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
I think Jim Marshall May have even tested it ... does anyone recognise his signature on the "Test" label? 20210407_122550.jpg
 

neikeel

Well-Known Member
Joined
Feb 12, 2014
Messages
6,994
Reaction score
6,317
I’m afraid Jim Marshall would not have a clue how to test an amp although I believe he was useful in the cab trimming team.
Looks like a 68 or early 69.
The amp has had work done evident by the replaced fuse holders and you can see that the output transformer is a replacement of long-standing.
When you get chance to pull the chassis out and photograph the circuit boards we can give you a comprehensive appraisal.
 

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
I'm going to take it to Marshall HQ next week to run it up ... see if it still works ..... I'm kinda excited and scared at the same time
 

Seanxk

Well-Known Member
Joined
May 14, 2018
Messages
931
Reaction score
839
Don't do that, they will ruin/devalue it by changing caps etc

They haven't got the time to run it up slowly either.
 

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
hmmmm .... ok I should clarify with them first - what they might do for their test. How would someone normally deal with starting up an amp slowly in this condition?
 

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
Is it better to pass on to a new owner and let them sort that out? Or is it more useful to pass on an amp that you know works?
 

fitz288

Well-Known Yinzer
Gold Supporting Member
Joined
Apr 7, 2020
Messages
5,420
Reaction score
14,446
Location
the Burgh
Is it better to pass on to a new owner and let them sort that out? Or is it more useful to pass on an amp that you know works?
If you want to spend money to "make sure it works" and then turn around and sell it, you probably won't get your "make sure it works" money back in increased sale price.
 

Seanxk

Well-Known Member
Joined
May 14, 2018
Messages
931
Reaction score
839
There's no real benefit to taking it to Marshall, they will certainly get it running again, but it may not be to your advantage value wise in the work they do, for most people it would not add value and probably lessen it.
Where are you located?
 

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
There's no real benefit to taking it to Marshall, they will certainly get it running again, but it may not be to your advantage value wise in the work they do, for most people it would not add value and probably lessen it.
Where are you located?
well I'm only 10 miles away from the Marshall facility in Bletchley, UK
 

StuC

Active Member
Joined
Feb 12, 2014
Messages
120
Reaction score
156
well I'm only 10 miles away from the Marshall facility in Bletchley, UK

Don't take it to Marshall, whatever you do. They are not capable of sympathetic service or restoration work on vintage amps - the Bulgin will be replaced with an IEC to make it "safe" for a start. As Seanxk says, they'll get it working, but they will ruin its originality and it will be harder to sell to a serious collector. You'd do better to sell it as-is than spend money having Marshall decrease its value.
 

redfish

Member
Joined
Dec 14, 2011
Messages
35
Reaction score
17
Don't take it to Marshall, whatever you do. They are not capable of sympathetic service or restoration work on vintage amps - the Bulgin will be replaced with an IEC to make it "safe" for a start. As Seanxk says, they'll get it working, but they will ruin its originality and it will be harder to sell to a serious collector. You'd do better to sell it as-is than spend money having Marshall decrease its value.
OK Thanks ... I appreciate the advice ... great to have a forum like this
 

neikeel

Well-Known Member
Joined
Feb 12, 2014
Messages
6,994
Reaction score
6,317
Which direction 10 miles from Bletchley?
 


Top