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Glassware Aikido All-in-One (Octal) | ACF-2 Buffer
Glassware Aikido All-in-One (Octal) | ACF-2 Buffer
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Old 12th December 2018, 01:53 PM   #11
Alashikata is offline Alashikata
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This is the reason I don't know if I ever buy his products again. At least, he should give a set of value that know to work properly then other options for people to play around. I believe all his manuals are like that.

I guess this is for experts than a regular DIY that has all the measurement and testing equipment. I don't have any testing equipment so I am doing the guessing only. Anyone doesn't have electronic skills, then this is not for them.
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Old 27th January 2019, 12:18 PM   #12
sunil is offline sunil  India
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Default Aikido ACF-2

So, I've got this going. The board is populated, with both PS supply. The heaters are running at 5.95 /6.12V. The HT at the pins is 132V.

The tubes are 6SN7 - RCA Smoked Glass (Grey'ish). I'm also confused about the output cap C1. Thinking of 0.22uF (K40-Y9), since I have a pair.

Are these numbers fine ?
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Old 27th January 2019, 12:37 PM   #13
Steve Morley is offline Steve Morley  Canada
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Default It depends....

It depends on the input impedance of the next stage. If it's low, 10K or lower, the low frequencies might roll-off too soon. If it's say, 100K or higher you might be OK. Try it and see.
The Broskie boards being very thick, makes it difficult to remove parts once installed. See picture, you might want to try this trick with the O/P caps that I used on Tetra phono board resistors. Just in case you want to change them out for larger ones later.

Steve
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Old 27th January 2019, 01:24 PM   #14
sunil is offline sunil  India
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The heater AC is 12-0-12 and HT is 130-0-130. R4 & R7 are 4.7K.

I was trying to keep the current between 8 & 10ma. Is that right ? Good /bad ?

I have a few amps (SS) and tube. The SS are all 50K input impedance.

Sansui999 /Sansui 9500 /Sansui D907 /Kenwood L-05 /Nakamichi PA-07 /Krell KST100

Brook 12A Clone
Elekit 8200
J.E Labs 2A3 S.E

Would 0.22uF be ok here. Not planning on any more SS, maybe a few more tube projects.
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Old 27th January 2019, 02:06 PM   #15
Steve Morley is offline Steve Morley  Canada
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The Elekit 8200 has a 50K pot in parallel with a 100K resistor so the input imp. might be a bit low for an a 0.22 output cap. If you have lots of gain stick a 50K to 100K resistor between the input select sw. and the pot.
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Old 27th January 2019, 02:17 PM   #16
sunil is offline sunil  India
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Thanks Steve. Didn't get the bit about 'gain' and additional resistor.

0.47 fine ?
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Old 27th January 2019, 02:27 PM   #17
Steve Morley is offline Steve Morley  Canada
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Better than the 0.22. You'll just have to try it and see.
What will your B+ voltage be? Will you be putting 260 volts (130 + 13) into a full wave bridge? What B+ does Broskie recommend with the 6SN7s?
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Old 27th January 2019, 02:30 PM   #18
sunil is offline sunil  India
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B+ is runnig at 132v. Broskie uses 130v as an example, so I stuck with it.
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Old 27th January 2019, 04:11 PM   #19
Steve Morley is offline Steve Morley  Canada
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The Elekit amps are in essence power amps with a volume control at the input. Their gain is usually quite high so they can be used directly with a high level source. If you have the situation where you are using them at the bottom of the volume pot range then by inserting a resistor shown at the red X on the attachment you can get a more useful range on the volume pot and increase the input impedance.
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Old 27th January 2019, 11:24 PM   #20
sunil is offline sunil  India
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Ok, got it. The Elekit has worked well so far with various preamps, the vol. at 12 'o clock.

Should I just go with 1uf. Damn, this is hard to decide...

John B has a note on how to decide this. Going with 50k input imp. and a corner frequency of 3.18hz, 1uF will be fine.

I've got two pre-outs on the chassis. Can I hook up direct, in parallel from the board.
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