Hi guys I have a JVM 410h and I would like to change the EL34's to 6550's could anyone please help me with the mod. I was told that I only have to change the bias resistors from R38 and R50 36k to 82k and the G2 resistors R34-35 R40-41 from 1k 5watt to 2.2k 5watt. I do have the schematics for it if you need it.
Also If it can be done.
Thanks Guys
http://i1125.photobucket.com/albums/l58 ... 0b3413.jpg
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JVM 410h Help
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JVM 410h Help
by 6B4G » Wed Sep 19, 2012 3:19 am
Last edited by 6B4G on Wed Sep 19, 2012 11:55 am, edited 2 times in total.
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6B4G - KT88
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by 6B4G » Fri Sep 21, 2012 2:01 am
I think I found the answer, you can only make the change to all tubes and not only to a pair. The reason is that it uses 4 tubes in a PP config with one OPT so saying that you are able to remove one of each side of the PP to reduce the amp to 50 watt plus you have to adjust your bias. It makes no difference if you take out the inner tubes or outer tubes of the pairs.
Saying this you can not use two dif tubes on one side of the OPT.
Saying this you can not use two dif tubes on one side of the OPT.
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6B4G - KT88
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by Geek » Fri Sep 21, 2012 3:58 am
I think you got an amp we don't have experience with. Sorry for the lack of answering 
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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Geek - KT88
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