The 'NEW' YAQIN MS-20L Integrated Vacuum Tube Amp Thread - Page 29 - AVS Forum | Home Theater Discussions And Reviews
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post #841 of 841 Old 01-26-2016, 01:13 PM
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Originally Posted by rntlee View Post
Just a FYI for everybody...

I tried my GE jan5654w's in my amp again, just to give them a second shot. I noticed a faint high-pitched whine from the right channel while the amp was idling with no signal. I promptly pulled the 5654's and put my 6j1p-ev's back in.

I looked up the data sheet for the GE 5654's and it specifies a maximum heater to cathode voltage of 90v. This amp uses an SRPP (the Chinese love this circuit) in the input stage and the cathode in the top tube gets close to 100v applied to it. I think the sound I could hear was leakage from the the heater to the cathode. The Russian 6j1p's I have are spec'd to a max heater/cathode voltage of 120v.

So, heads up to anyone else running 5654's in your amps...they're out of spec by quite a bit in this amp.
Hello rntlee. Sorry to revive an old thread, but could you confirm for me that the Mullard M8100 has a maximum heater to cathode voltage (Vh-k) of 130 volts according to the spec sheet I've attached? Just want to make sure I'm interpreting the info correctly before purchasing an octet. Thank you in advance!

Attached Files
File Type: pdf M8100.pdf (406.9 KB, 13 views)
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