VSSA Through-Hole-PCB build thread

[still4given]

No, that's a Mr Evil/PMI Cap multiplier. I'm actually going to use my DX regulator for my SKA GB150 because it has +/-50V rails.

I have had this amp playing all day today. I just can't get over how good these sound. Clear, rich, great sound stage, just beautiful.

 

[Lazy Cat]

I'm happy for you, enjoy

 

[freeman]

No, that's a Mr Evil/PMI Cap multiplier. I'm actually going to use my DX regulator for my SKA GB150 because it has +/-50V rails.

I have had this amp playing all day today. I just can't get over how good these sound. Clear, rich, great sound stage, just beautiful.

Wow, Terry. Looks good! Can you describe your grounding scheme? Do I see a ground loop break? Also it appears you may have resistors connected to inputs. Is that correct? Thanks for sharing your photos.

 

[still4given]

Wow, Terry. Looks good! Can you describe your grounding scheme? Do I see a ground loop break? Also it appears you may have resistors connected to inputs. Is that correct? Thanks for sharing your photos.

I'll probably get criticized for this but I used the ground points on the cap multiplier as my star ground. There are no resistors on the inputs. If you look at the pic of the inside rear panel you will see that I have the screens of each input lead connected to a bolt in the back plate. I also attached the 10R/diode combination from one of the speaker grounds to that bolt. The amp is very quiet.

 

[ktta]

Hi Pete,
If there are any boards left I am interested in one set, eventually with the optional components.

 

[Ranchu32]

Terry, thanks for the photos. I enjoy following your builds and this one is no different. I look forward to completing my VSSA soon after reading your positive comments.

 

[metallicus69]

Regarding input transistors, what do you fellows think about 2sc1775/2sa872 ? They are 90V devices (120V for A suffix) and hFE can be as high as 1200. I know the layout is ECB compared to BCE for BC546 but that should not be much of a problem.

Cheers!

 

[fab]

Regarding input transistors, what do you fellows think about 2sc1775/2sa872 ? They are 90V devices (120V for A suffix) and hFE can be as high as 1200. I know the layout is ECB compared to BCE for BC546 but that should not be much of a problem.

Cheers!

All my"VSSA" amps have 2sa970/2sc2240 which are similar. In fact I have no version yet with the BC5xx transistors....

It should work fine.

Fab

 

[ivanlukic]

I have had this amp playing all day today. I just can't get over how good these sound. Clear, rich, great sound stage, just beautiful.

A single word to describe VSSA (and similar topology CF amps) is musicality. You can listen music for hours and still want some more.

Now you can listen from Jesse Colin Young and Bread to Grand Funk and Rare Earth without fatigue.

 

[Bangla H]

Hallo Peter
Hope you can also satisfied me and i will be lucky user from your through, fett Fingers,
Hole VSSA Amps.
I also want use the Multiplier PSU.
Each 2 of Boards please. Also a Set JFet and KSA1381,KSC3503 Driver the Rest i will find by Grabbelbox- myself.
Payment via PayPal is possible.
Thanks

 

[Sheldon]

Also interested in two boards plus transistors and Fet's.

Sheldon

 

[kp93300]

Hi Pete,
payment made for

1 set of VSSA boards, 5 sets of BC546c/556c and 5 sets of ksa1381/ksc 3503

thanks

kp93300

Hi Pete,
Have you mailed out these items ?
payment made in mid November.

thanks

kp93300

 

[Ranchu32]

Can anyone recommend an alternative to the ksa1381/ksc 3503 that is readily available?

 

[Rick G]

I used KSA1220AYS & KSC2690AYS
Mouser has them Both for around .57 cents each or .33 in Qty of 10

 

[metallicus69]

Usable transistors are well summarized here .There are even better parts but they are harder to find. But i guess the page is still a good starting point.

 

[kp93300]

Usable transistors are well summarized here .There are even better parts but they are harder to find. But i guess the page is still a good starting point.

Under the ranking column----are lower numbers indicating better choice ???

 

[metallicus69]

I am not sure what that ranking means. That is Greg's page, not mine. What matters most here seems especially the lower C0b, higher hFE and higher fT. Not sure which matters more and how much, as there are reports that the amp sounds superb even with BD139/140.

 

[still4given]

Actually I have noticed a trend where guys seem to think the BD139 is the preferred device in amps with rails below +-39V.

 

[jkuetemann]

The BD139 / BD140 was the original choice of Shaan in the PeeCeeBee thread, and very worthy of keeping it in mind. The other transistors being used are either to try and maximize performance (like the obsolete KSA1381E / KSC3503E) or for greater availability and utility (like current production KSA1220AY / KSC2690AY). I went for availability and utility.

 

[kp93300]

Anybody has any idea what happen to PMI?
His PM box is full.
I send my payment on 16 nov 2013 by pay pal and have not received any acknowledgement or the goods.

kp93300