Quicksilver 8417 Power Supply Question - Page 2

Original Burnedfingers · 8th May 2012, 10:29 AM

That is a nice front end. I am partial to the 6SJ7 as the VA. I think that front end would sound much better than the stock 12AX7 12bh7 of the 8417.

tympani1d · 15th May 2012, 07:57 PM

Hello.
I know this is slightly off topic but as I do not often see QS 8417 questions asked..
Has anyone here mucked about to use sweep tubes in these? It seems a very good candidate for such a mod. Nice simple topology and should sound great, powerful, plus not require geek tweek fiddly stuff?
Second question, what bias current are people setting when they convert to the ¨Super¨ 6BG6GA (7027 innards), 6L6 (6P3C) variants?
I have just installed my last two matched Sylvania 8417´s. All four of my amps are modified to allow bias setting for the other tubes and I do have 4 matched quad sets of the 6BG6GA and the socket adapters..
But I have no idea what bias current to set.
Thank you.

Original Burnedfingers · 16th May 2012, 10:40 AM

The Super 6BG6GA's can easily run 50mA bias each without a problem. I've run them in my modified 8417 mono blocks. Pull out the 8417's and put them on the shelf for another day.

tympani1d · 16th May 2012, 05:45 PM

Quote:

Originally Posted by Original Burnedfingers

The Super 6BG6GA's can easily run 50mA bias each without a problem. I've run them in my modified 8417 mono blocks. Pull out the 8417's and put them on the shelf for another day.

Thank you... I´ll give them a try.

soundfire · 17th May 2012, 01:33 AM

if you bias your amp,you have to matched the plate current of the two tube of each monoblock by at least 5% without exceeding the maximum allowable plate dissipation.

15th May 2012, 07:57 PM	#12
tympani1d diyAudio Member Join Date: Dec 2009 Location: Northern Illinois USA	QS 8417 --> Sweep Tube? How To? Hello. I know this is slightly off topic but as I do not often see QS 8417 questions asked.. Has anyone here mucked about to use sweep tubes in these? It seems a very good candidate for such a mod. Nice simple topology and should sound great, powerful, plus not require geek tweek fiddly stuff? Second question, what bias current are people setting when they convert to the ¨Super¨ 6BG6GA (7027 innards), 6L6 (6P3C) variants? I have just installed my last two matched Sylvania 8417´s. All four of my amps are modified to allow bias setting for the other tubes and I do have 4 matched quad sets of the 6BG6GA and the socket adapters.. But I have no idea what bias current to set. Thank you. __________________ I think; therefore will NOT be Politically Correct.

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8th May 2012, 10:29 AM	#11
Original Burnedfingers diyAudio Member Join Date: Nov 2002	That is a nice front end. I am partial to the 6SJ7 as the VA. I think that front end would sound much better than the stock 12AX7 12bh7 of the 8417.

16th May 2012, 10:40 AM	#13
Original Burnedfingers diyAudio Member Join Date: Nov 2002	The Super 6BG6GA's can easily run 50mA bias each without a problem. I've run them in my modified 8417 mono blocks. Pull out the 8417's and put them on the shelf for another day.

17th May 2012, 01:33 AM	#15
soundfire diyAudio Member Join Date: May 2012	if you bias your amp,you have to matched the plate current of the two tube of each monoblock by at least 5% without exceeding the maximum allowable plate dissipation.