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model TRT 100 [message #12701]

Wed, 20 January 2010 17:49

lowlife00
Messages: 6
Registered: January 2010

Junior Member

No Message Body

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Re: model TRT 100 [message #12702 is a reply to message #12701]

Thu, 21 January 2010 06:17

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

Hello! Hello!
Is anybody there?

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Re: model TRT 100 [message #12703 is a reply to message #12701]

Thu, 21 January 2010 11:14

lowlife00
Messages: 6
Registered: January 2010

Junior Member

Sorry about delayed responce had to go to work but im back, to answer your questin I have a late 70s early 80s kustom model TRT 100 all tube lead amp. What I need to know is what are the correct pots to use? pots crackle and cut out alot.

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Re: model TRT 100 [message #12704 is a reply to message #12703]

Thu, 21 January 2010 11:34

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

Have you tried cleaning them with a high quality contact spray cleaner like DeOxit?

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Re: model TRT 100 [message #12705 is a reply to message #12701]

Thu, 21 January 2010 12:04

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

also the TRT 100 model did not come into being untill 1999.
I have one of these models and if I am not mistaken cleaning the pots will be quite a chore!

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Re: model TRT 100 [message #12706 is a reply to message #12701]

Thu, 21 January 2010 12:10

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

A can of Radio Shack cleaner/lube may be easyer and faster for you to findas thats what I use most of the time. You will need to wipe off any excess dripping from the pots due to the posts and tube sockets being mounted on the same circuit board, wrapping strips of paper towles around each pot will help as will packing some around the entrance area of the pot so no spray comes out.
Use only the amount you need to get rid of the pot noise.

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Re: model TRT 100 [message #12708 is a reply to message #12704]

Thu, 21 January 2010 22:43

lowlife00
Messages: 6
Registered: January 2010

Junior Member

1999 cool was not aware of that I have tryed cleaner with only short lived results looking to fixing the problem beleive it to be beyond cleaning

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Re: model TRT 100 [message #12716 is a reply to message #12701]

Fri, 22 January 2010 13:05

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

First question I have, is what type of cleaner did you use before?

I imagine that all of the pots are pc mounted. They will probably have a resistance value printed or stamped on their cases. This stamp will sometimes also include a code letter that indicates the taper as well.

Open up the amp and measure the diameter of the pot cases. They will be maybe 16mm or 24mm. Then write down the values and taper codes for each pot.

Once you have the list, check online suppliers like Digikey or Mouser, etc. and you should be able to order what you need.

Now one problem that may come up is the shaft type. If the knobs are push on types that need knurled shafts, you may have a problem finding those in all the values that you need.

Hope this helps.

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Re: model TRT 100 [message #12718 is a reply to message #12701]

Fri, 22 January 2010 14:38

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

Lowlife.If you need it I have the schematic for the TRT100 and can scan it for you on Moanday email to you if you PM your adress.
From what I recall from having my amp opened up the last time is that the pot size is not 24mm.
Only rarly have I had to replace pots in such a new amp though. I have unsoldered them from the board, un- bent the tabs that holds them together and soaked them in soapy hot water and bruched them with a real soft tooth brush,then air dryed them off and lubed the carbon trace back up with a wipe of spray cleaner/lube.
If you have to wipe the carbon trace to clean it or lube it use nothing but a Q-tip.
You may see wiper marks on the carbon trace from the contacts and that is ok, but any grooves would mean its time to replace the pot.

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Re: model TRT 100 [message #12722 is a reply to message #12716]

Fri, 22 January 2010 20:53

lowlife00
Messages: 6
Registered: January 2010

Junior Member

I took it in had it retubed and balaced , the reverb fixed ,and pots crackling.the thech i had do it is on the road right now as a guitar tech I belive he used good stuff. any way the amp was great for 9 mo. then sligtly over time the pots have started to crackle hiss and cut out, tap on the pot sometimes gives momentary stability. Also thank you for answering my quistin about pots thats what I needed to Know

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Re: model TRT 100 [message #12723 is a reply to message #12718]

Fri, 22 January 2010 20:59

lowlife00
Messages: 6
Registered: January 2010

Junior Member

please I would appreciate haveing a copy of scmatics for the TRT 100 you can send them to bigred21@mchsi.com and thanks agine it may really come in handy

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Re: model TRT 100 [message #12741 is a reply to message #12701]

Mon, 25 January 2010 06:09

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

whaen the amp was working ok for you did you find it had enough clean head room for you?

The reason I ask this is due to the fact that when I first got my amp and went to set it up on my test out rig, I found that it only put out 60 watts RMS not 100 was the amps model number would lead you to beleive.
The reason for this difference is thatit seems that the output transformer is wound to make use of EL34 type output tubes not the 6L6GC tubes it comes with.
When you install EL34 out put tubes the amp will then put out 92 watts RMS or a 50% cain in power!
I think this swap was done due to the fact that Kustom engineering/desinger`s screwed up with the needed spec`s of the amps power trandformer, as it can not supply the additional heater current that the EL4`s need compaired to the 6L6GC tubes the amp comes fitted with.
So in short what they did to get around the problem was to just switch to 6L6 type tubes.

You can get around the problem if need be by install a seperate 3 amp 6.3 volt filiment transformer, and wire it up to just power the heaters on two of the output tubes`s.
EL34 tube`s play totally different than the 6L6GC`s do because EL34`s are not have electron beam froming plates in them asthe 6L6`s do.
A EL34 tube has a more playable dynamic range and provides more control over how fast the tube start`s to clip when played hard.

Untill I found this out about my amp I always wondered why the price of these amp`s went from 740 bucks down to the price of 400 when I picked mine up, and I now think preceding explane`s why!

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Re: model TRT 100 [message #12742 is a reply to message #12701]

Mon, 25 January 2010 06:10

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

I will fire you off a schematic tomorrow morning.

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Re: model TRT 100 [message #12764 is a reply to message #12701]

Tue, 26 January 2010 15:47

stevem
Messages: 4773
Registered: June 2004
Location: NY

Senior Member

I emailed you a scan of the schematic this morning, but I got sent a notice that you sever or whatever refused it.

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Re: model TRT 100 [message #13002 is a reply to message #12701]

Tue, 16 February 2010 11:19

lowlife00
Messages: 6
Registered: January 2010

Junior Member

any one want to buy a kustom model trt 100 has crackly pots beyound my capabilitys just got re tubed and ballaced and reverb fixed prfessionaly pots work well if you set and dont adjust buying a marshall Very Happy

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