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TR12L T&R 20 watt amp [message #20054]

Tue, 28 January 2014 01:36

kustomhead
Messages: 121
Registered: April 2012
Location: Redding, Ca

Senior Member

Does anybody know what a replacement bulb is for the TR12L practice amp? It looks like the bulb and housing are one piece.

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Re: TR12L T&R 20 watt amp [message #20063 is a reply to message #20054]

Tue, 28 January 2014 06:49

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

I have one of those and the one time I when in it to clean its pots I did not take notice that much of the lamp.
I do recall that it is one peice, but I can not say if its is a lamp run off ac, or a LED and run off dc.
What I can tell you is getting that pack panel off which must be done to get the chassis down and out was a freakin nightmare!!
What I ended up doing was grabbing one of my old straight tip screw drivers, grinding it so it was somewhat rounded like a finger nail, and then placing 3 layers of black electric tape over that. This let me slip it in the gap without too much covering damage to pry the back out!
After that getting the chassis out is also a fight, as its also a very tight fit in the cabinet.
Thses where not made with the notion of anyone working on them!!!

[Updated on: Tue, 28 January 2014 06:50]

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Re: TR12L T&R 20 watt amp [message #20064 is a reply to message #20063]

Tue, 28 January 2014 11:53

kustomhead
Messages: 121
Registered: April 2012
Location: Redding, Ca

Senior Member

I got the chassis out sasily because someone previous had removed the screw under the transformer and left it out. It looks like an led type.

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Re: TR12L T&R 20 watt amp [message #20076 is a reply to message #20054]

Fri, 31 January 2014 06:28

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

measure the voltage back at its circuit board connections to see if its ac or dc, if its dc than you need a LED rated for .5 to 1 volt more than you found with your meter for good LED life.
You can use a lower voltage rated LED but than you must place a small resistor in serise with one of its leads to keep the DC volatge below what the LED is rated for.
Resistor values of 33 to 100 ohms nost times do the trick and a 1/2 rating is good.
Many times I have had to fix amps with LED lamps I cound get to match up size wise buy cutting off the shank portion of the original LED and clear siliconing a clear or red LED bulb to its rear where I cut it off.

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