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Old 30th December 2012, 11:17 PM   #111
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So what the deal ZM? DO i have a weak SS? IT just runs out of juice no matter how much gate voltage I throw at it.
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Old 30th December 2012, 11:40 PM   #112
6L6 is offline 6L6  United States
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buzzforb -

If you have the time, can you see if the FQA work in circuit in both ACS and output positions?
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Old 30th December 2012, 11:53 PM   #113
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Quote:
Originally Posted by buzzforb View Post
So what the deal ZM? DO i have a weak SS? IT just runs out of juice no matter how much gate voltage I throw at it.
depends what you think with "how much"

1A is good in my book , if you're going to 2 pairs , so that'll be 2A overall

I'm cheapskate , so having just 2 outputs (both SJEPs) in my BJ2 , for 100W dissipation

I'm pretty sure that your SJEPs are good , so everything is just matter of LTP drain resistor , and base feed in A CCS
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Old 30th December 2012, 11:56 PM   #114
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6L6,
Will do. It sounds pretty good. Always liked the Aleph J. Dont have enough gain in current setup. Not quite as much as the F5t, which worked ok with passive volume control. Hope to habe more info on both the SS fets and their effect on the circuit, as well as the FQA. May take some time, but ill get to it all. Aleph is a smooth amp. Need to try F3:devil:
EDIT: Need to try doubling jfets in FE as well.
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Old 31st December 2012, 12:01 AM   #115
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Quote:
Originally Posted by Zen Mod View Post
depends what you think with "how much"

1A is good in my book , if you're going to 2 pairs , so that'll be 2A overall

I'm cheapskate , so having just 2 outputs (both SJEPs) in my BJ2 , for 100W dissipation

I'm pretty sure that your SJEPs are good , so everything is just matter of LTP drain resistor , and base feed in A CCS
Got to do further investigation as there is too much difference between channels with exact jfet FE. All are Idss of 10.6. Must be somthing about output fets that is different. Either FQA or SS, but i am leaning toward SS, because plenty of adjustability in bias of FQA, but SS runs out of steam. There has to be reason.
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Old 31st December 2012, 12:04 AM   #116
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buzzforb - great progress !!!

"so everything is just matter of LTP drain resistor"

Help please LTP =?

Thanks
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Old 31st December 2012, 12:09 AM   #117
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Two sJ74 jfets in the FE. He is talking about the pot and its affect on both DC bias and AC gain.
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Old 31st December 2012, 12:18 AM   #118
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Thanks buzzforb

It will be interesting to see how the 109s behave. Maybe I can cobble together a power supply and give the Jango a go. Hate to take the F6 apart at this point.
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Old 31st December 2012, 12:22 AM   #119
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Wait. Let me do the legwork. Got enough SS to have both up and running, so a comparison will be easy. Be safe coming home.
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Old 31st December 2012, 12:51 AM   #120
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nice work guys! keep us posted!
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