Your preamp likely outputs a large pulse upon turn on and turn off.
Verify this with an oscilloscope. You will need an output muting circuit for the preamp.
I would've guessed parasitic oscillation. Guess we'll find out.
My f6 is a diy build. I had my sp14(another Diy with 6ns7 tube) already running and playing my tube lab SSE turned my pass F6 on and proceeded to hook up the pre already running and saw slight smoke. Thankfully my F6 is still working and running fine off the nodi 2.playing a little Larry carrolton Last night album
...... turned my pass F6 on and proceeded to hook up the pre already running and saw slight smoke.
Never a good idea to hook up components when they are on.
It appears to be in my power supply. I hooked my sp14 preamp to the f6 but did not turn it on. Turned on the f6 and both power lights( red led) came on, within seconds the right light dimmed smoke came off the resistors and the light went out. Hooked up nodi2 wcerything works fine.
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So it smokes with two of your sources but not with one?
Do the two sources that cause smoke have safety ground (3 prong plugs) and the one that does not smoke only has a two prong plug?
Please post a picture showing all of the amplifier (an overall shot).
Something is causing excess draw on the V- part of the power supply and the excess draw is burning the resistors.
Do the two sources that cause smoke have safety ground (3 prong plugs) and the one that does not smoke only has a two prong plug?
Please post a picture showing all of the amplifier (an overall shot).
Something is causing excess draw on the V- part of the power supply and the excess draw is burning the resistors.
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When I first built my F6.. I used my venerable George Wright triode type Tube pre.
The F6 sounded BAD. Couldn't believe it.
Finally unplugged the Pre and ran a stepped attenuator direct from sources and the sounds were/are exquisite.
Tube pre clearly didn't work with the F6.
Don't know why, don't care.
It's doing closet duty.. for the rest of My life.
The F6 sounded BAD. Couldn't believe it.
Finally unplugged the Pre and ran a stepped attenuator direct from sources and the sounds were/are exquisite.
Tube pre clearly didn't work with the F6.
Don't know why, don't care.
It's doing closet duty.. for the rest of My life.
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