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Old 9th February 2012, 05:19 AM   #651
generg is offline generg  Germany
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They may be obsolete ..... I found only a yellow single turn looking at Google for Vishay and pictures
here is an example


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Old 9th February 2012, 05:36 AM   #652
generg is offline generg  Germany
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Maybe Bournes blue body white rotation part....

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Old 9th February 2012, 12:23 PM   #653
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I personally do not like the single turn pots. Multi are much easier to use and adjust and will fit the board just fine. BTW. I have single turn on my boards and when i got to balanced, I will be switching them out.

Also, IMHO, the BA3 presents the kind of sound that makes me want to stop building amps. and just listen. You have before you a scalable no feedback amp that is capable of extreme low distortion and wonderful sound. I have tried IRF fets and lateral fets in output. I have yet to try Fairchild parts, but seem disinterested because they are impossible to find and i only have 6 pairs. I only have these thanks to Generg. The laterals do not push outinto the room like the IRF, but have a much richer, fuller, and more accurate tone. I have some of the fets for the EUVL f5X that i have enough of to try and may do so based on the fact they seem to work well in this type situation in my reading.

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Old 9th February 2012, 12:51 PM   #654
Botte is offline Botte  United States
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Originally Posted by buzzforb View Post
Also, IMHO, the BA3 presents the kind of sound that makes me want to stop building amps. and just listen. You have before you a scalable no feedback amp that is capable of extreme low distortion and wonderful sound.
Hi Buzzforb,

I totally agree! I’m running 10pr of old IRF240/9240 (TO3) with 6 amps bias and +-18V rails. I’m just blown away by the sound. Open and present with a great sense of space. It’s like a cross between an F3 and the F5, open and sweet and with punch and control. It’s a little more complicated to build than the F5 and it is worth the effort.
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Old 9th February 2012, 01:07 PM   #655
generg is offline generg  Germany
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Hi buzzforb,

Happy to hear that you like your present sound so much ...... That building is no more so important. I have just the same point.....

It seems that the pots in Nelson's picture are single turn ...... Of course I like the multi turn also more, but ra7 was looking for the same type so I wanted to help him....
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Old 9th February 2012, 01:10 PM   #656
Zen Mod is offline Zen Mod  Serbia
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...... That building is no more so important. I have just the same point.....
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Old 9th February 2012, 01:26 PM   #657
Botte is offline Botte  United States
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Hi buzzforb,

Happy to hear that you like your present sound so much ...... That building is no more so important. I have just the same point.....
Until the F6
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Old 9th February 2012, 01:43 PM   #658
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For those of you who have built the BA-3, what part did you use for the pots? I cannot find anything on mouser and digikey that is similar to what Papa has shown in the article.
I ordered some from Farnell in the UK which appear to be the same as in Nelson's photo. I think they were 0.5W

Order code: 9355014 (100R) and 9355103 (500R).
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Old 9th February 2012, 01:56 PM   #659
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Hi buzzforb,

Happy to hear that you like your present sound so much ...... That building is no more so important. I have just the same point.....

It seems that the pots in Nelson's picture are single turn ...... Of course I like the multi turn also more, but ra7 was looking for the same type so I wanted to help him....
I know you were just helping, i figured i would throw in the multiturn suggestion. I have been in the situation too many times where i didnt think beyond what was on the page in front of me.
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Old 9th February 2012, 02:01 PM   #660
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I have tried IRF fets and lateral fets in output.
Hi Buzzforb,
What are these laterals you refer to? They sound interesting.
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