Burning Amp BA-3

[evanc]

sissy amp

Sissy. I'm noticing the nails popping out of the wall behind the speakers.

 

[bcmbob]

Sorry guys, but I'm a brand new nubee - all over again with this amp. I've read posts 845 -863 and am still rather thick in the head. I'll just throw what I have so far and welcome corrections. Too da*n many Ds for an amp that touts "KISS"

Could be completely wrong - but that wouldn't be the first time.

 

[6L6]

That looks good.
You could split the FE board and use the PSU from the amp sides...

 

[evanc]

Looks correct. I saw no reason to bring the output back to the bias board, but maybe there is one.....

 

[bcmbob]

The blue line from the FE (left) to B board (right) ends between D+ and D-. Which one?

I took my lead on the front end PS from these. Would be great if it's not necessary.

 

[buzzforb]

He was using the BA3 as a preamp. Beefy pre if I may say so myself.

 

[bcmbob]

Looks correct. I saw no reason to bring the output back to the bias board, but maybe there is one.....

Star Grounding?

 

[bcmbob]

Thanks All - Time to fill in the BOM.

 

[noSmoking]

Arethe "S" pads needed

Sorry guys, but I'm a brand new nubee - all over again with this amp. I've read posts 845 -863 and am still rather thick in the head. I'll just throw what I have so far and welcome corrections. Too da*n many Ds for an amp that touts "KISS"

Could be completely wrong - but that wouldn't be the first time.

Hi,
The S pad on the output board is it connected to S on the bais board? and the other S on the bias board needs to connect to anything?
Last piece of the puzzle,lol.
Thanks

NS

 

[bcmbob]

Are there any advantages or disadvantages to using cement resistors for R3 - R12 on the BA-SO V2 output boards? I ask only because I've seen several discrete amp builds that have them.

 

[noSmoking]

hi bcmbob ,try these,I use met film myself ,but have had amps with the "cement" wire wound types too;;;;
Aiken AmplificationResistorNoise.htm‎
http://www.irctt.com/pdf/Resistors_Surge_Conditions_PMDL_Feb07_article.pdf
http://www.texascomponents.com/pdf/Vishay-Demo.pdf

 

[bcmbob]

Good info to digest. Thanks.

 

[bcmbob]

Last two items for BOM. The pic shows availability as I can find today. Is this combination acceptable, or do I need to stay within a specific column for proper match/operation?

 

[evanc]

I used fairchild parts seem to work fine. Needed to adjust some resistor values to make them work.
p1 and p2 became 1k instead of 500r

 

[bcmbob]

I'm willing to make whatever adjustments are needed, but will that combination provide at least basic/non optimal operation as a starting point?

 

[evanc]

To me the parts seem fine but someone more knowledgeable can probably say more.

If that's what is available decision seems made.....

 

[bcmbob]

Unless I hear differently - I'll wing it. Thanks.

 

[buzzforb]

I have some Toshibas if you are interested.

 

[bcmbob]

I have some Toshibas if you are interested.

PM on the way.

 

[bcmbob]

Is there a published build and/or initial start-up/test/adjustment procedure for the BA-3 front end somewhere on the forum? I haven't located one yet. Would be good to confirm proper operation before I hook it up to something else.