Aragorn777
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- Aug 8, 2011
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Hi guys, greetings from Spain
Yes, another one TSL100/122 board with thermal issue and Bias drift.
I bought my Marshall in 2000 but in the sticker that it's in the back part appears 1998, so i suppose it was the Built year.
I played this amps very few, short times and always at home with low volume. Also i have a Mesa combo that i play more than TSL.
Last week i was playing and noticed that last power tube was near to red, so i checked the Bias and was a nighmare, changing each 5 minutes going higher and higher. The amp was sounding good but with a hum that was increasing in time. I switched off the amp.
The following day i connected the amp but the sound was very weak, having to turn the volume button on clean channel near to half, while the day before i couldn't pass from 2 (lot of volume)
I've read your post and seems to be clearly the mainboard issue, so i asked one to HotroxUK that is going to arrive next week.
I would want to know some important things abour the replacement of the board:
1.- How i can check that there isn't lethal voltage in the components of the board? I've red that has a bleed system that discharge any voltage in a period of 1 hour with the amp disconnected. Is it true? HOw can i check it?
Other messages say things about sandblock R71 and connecting a cable from each "feet" to chassis. I don't know....
2.- Any advice about the work of changing the board. I'll appreciate a lot.
Thanks for this forum
Yes, another one TSL100/122 board with thermal issue and Bias drift.
I bought my Marshall in 2000 but in the sticker that it's in the back part appears 1998, so i suppose it was the Built year.
I played this amps very few, short times and always at home with low volume. Also i have a Mesa combo that i play more than TSL.
Last week i was playing and noticed that last power tube was near to red, so i checked the Bias and was a nighmare, changing each 5 minutes going higher and higher. The amp was sounding good but with a hum that was increasing in time. I switched off the amp.
The following day i connected the amp but the sound was very weak, having to turn the volume button on clean channel near to half, while the day before i couldn't pass from 2 (lot of volume)
I've read your post and seems to be clearly the mainboard issue, so i asked one to HotroxUK that is going to arrive next week.
I would want to know some important things abour the replacement of the board:
1.- How i can check that there isn't lethal voltage in the components of the board? I've red that has a bleed system that discharge any voltage in a period of 1 hour with the amp disconnected. Is it true? HOw can i check it?
Other messages say things about sandblock R71 and connecting a cable from each "feet" to chassis. I don't know....
2.- Any advice about the work of changing the board. I'll appreciate a lot.
Thanks for this forum
