JCM2000 TSL60 little/no output

Sam · 09-07-2009, 02:31 PM

I used to be a member here but haven't been back in a while and I'm not sure of my details. Lurked around and cant't seem to find this problem so I wondered if anyone could help.

The amp has not been in use for almost a year until I started playing it at bedroom levels a couple weeks ago. I turned it on last night and found that there was no sound coming from the cab other than the slight hum I usually get (mains?). All lights on the front panel work (save for the one under the power rocker switch, I guess this is unrelated?) and all tube heaters seem to be glowing as normal. Today I had a closer look and found that cranking either of the OD channels gave some very quiet output from the cab but to my ears there is nothing from the clean at any level. I have a spare preamp tube I know to be good and one power tube, can I swap the power tubes out one at a time for testing or would i need to keep them paired at all times? I have not biased recently but it all sounded fine a few days ago.

Thanks for any help you can offer. Any more details I can think of or find, I'll add later.

Sam · 09-07-2009, 03:31 PM

SOLVED: v3 pre amp tube. (the harder to reach one behind the power tubes, maybe v4). Anyone know what this tube is for sure, just out of interest? Thanks for reading if anyone did.

thrawn86 · 09-07-2009, 03:48 PM

You should go to the Preamp Tubes: What, Where.....etc. thread and repost your question. MartyStrat knows more about tubes than the manufacturers themselves and he's there a lot.

09-07-2009, 02:31 PM	#1 (permalink)
Sam Junior Member Join Date: Sep 2009 Posts: 2	JCM2000 TSL60 little/no output I used to be a member here but haven't been back in a while and I'm not sure of my details. Lurked around and cant't seem to find this problem so I wondered if anyone could help. The amp has not been in use for almost a year until I started playing it at bedroom levels a couple weeks ago. I turned it on last night and found that there was no sound coming from the cab other than the slight hum I usually get (mains?). All lights on the front panel work (save for the one under the power rocker switch, I guess this is unrelated?) and all tube heaters seem to be glowing as normal. Today I had a closer look and found that cranking either of the OD channels gave some very quiet output from the cab but to my ears there is nothing from the clean at any level. I have a spare preamp tube I know to be good and one power tube, can I swap the power tubes out one at a time for testing or would i need to keep them paired at all times? I have not biased recently but it all sounded fine a few days ago. Thanks for any help you can offer. Any more details I can think of or find, I'll add later.

09-07-2009, 03:31 PM	#2 (permalink)
Sam Junior Member Join Date: Sep 2009 Posts: 2	Re: JCM2000 TSL60 little/no output SOLVED: v3 pre amp tube. (the harder to reach one behind the power tubes, maybe v4). Anyone know what this tube is for sure, just out of interest? Thanks for reading if anyone did.

09-07-2009, 03:48 PM	#3 (permalink)
thrawn86 Senior Member Join Date: Aug 2009 Location: Far Nor Cal USA Posts: 423	Re: JCM2000 TSL60 little/no output You should go to the Preamp Tubes: What, Where.....etc. thread and repost your question. MartyStrat knows more about tubes than the manufacturers themselves and he's there a lot. __________________ Drivin' faster in my car... 02 DSL 401-Ei's 02 1960b 02 Gibson LP Studio Silver 03 PRS Santana SE Holy Grail reverb Originally Posted by J. Robert Oppenheimer "We knew the world would not be the same."

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