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F6 Illustrated Build Guide
F6 Illustrated Build Guide
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Old 16th October 2018, 06:50 PM   #1211
kpsthakur is offline kpsthakur  India
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Originally Posted by 6L6 View Post
Yes. Photos please.
Sorry was having issues with Tapatalk app, sorted, will share pics tomorrow
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Old 16th October 2018, 07:19 PM   #1212
Zen Mod is offline Zen Mod  Serbia
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F6 Illustrated Build Guide
remove JFets and check them with simple Idss matching jig ( remember - 9V battery etc.)
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Old 18th October 2018, 01:00 AM   #1213
aljordan is offline aljordan  United States
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remove JFets and check them with simple Idss matching jig ( remember - 9V battery etc.)
Is it important to match all four (both channels) or just those for the single channel I had problems with?
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Old 18th October 2018, 01:33 AM   #1214
Zen Mod is offline Zen Mod  Serbia
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just channel
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Old 18th October 2018, 01:52 AM   #1215
aljordan is offline aljordan  United States
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just channel
Thanks. Everything is put back together and the amp is working fine again.
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Old 18th October 2018, 02:13 AM   #1216
Zen Mod is offline Zen Mod  Serbia
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care to make recapitulation?
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Old 18th October 2018, 03:47 AM   #1217
aljordan is offline aljordan  United States
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care to make recapitulation?
Sure. I am a bit embarrassed to say what took out the buffer in the first place. I was changing the configuration of a Pass active crossover because I wanted a full range signal going through the low pass leg for woofer measurement purposes, but I mis-configured one of the jumpers in the left channel. When I turned on the amp, the crossover sent some awful stuff into the left channel. I shut down the amp quickly and corrected the mistake on the crossover, but then the amp was producing a ugly hum through the left channel. That's when I found the smoked R4, and received the advice about the JFETS. I replaced R4 and the JFETS after running a check for shorts and making sure resistance figures agreed between both channels. Powered up and nothing ugly happened. I biased the channel up to 0.55 V after an hour, and nulled the offset.

I wonder if one of the original FETs was not in great shape prior to me destroying it, as I would get a fair amount of wandering values when I had previously worked on nulling the offset. I don't know enough to make an educated guess about anything though. The amp sounds quite a bit more dynamic and punchy now though, so maybe there was something amiss.
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Old 18th October 2018, 11:06 AM   #1218
Zen Mod is offline Zen Mod  Serbia
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it seems good now
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Old 30th October 2018, 10:12 PM   #1219
jonbon is offline jonbon
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I am waiting for all the parts to arrive for my F6 build, moving on from the gateway amp ACA

I seem to have ordered snap-in 1000uf capacitors .. will I be able to make them fit the board?
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Old 31st October 2018, 09:10 AM   #1220
mihstef is offline mihstef
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Default Is F6 (and all class a amplifiers) proper with 90db spl speakers?

Someone told me that speakers with SPL under 100db are hard to be moved by the class a amplifiers. It is true?

I certainly want to build a DIY amplifier and I'm especially interested in F6, so, is or isn't F6 proper or even compatible with the spl 90db (and 8 ohms) speakers which I have?

And if it is not, can you recommend me please, an other Diy amplifier (or more) that can be proper?

Please, excuse my questions, I'm a newbie and generally speaking I need advices, also from the theory but much more from your experience.

Thank you very very much.
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