Retro Amp 50W Single Supply

[prasi]

Hopefully this will entice some disco lovin' guys to build this version with modern transistors and relive those 70's and 80's as I come to know about this amp from reading online..
how is the logo?

regards
Prasi
P.S. reduced the size a bit.

 

[Bix]

very Cool logo

 

[Bruce@bluff]

Excellent work Prasi

 

[prasi]

Thanks guys, I will post PDFs and Gerber's tonight. I think I m done with fine tuning the layout.
Regards
Prasi

 

[prasi]

As promised

 

[Bruce@bluff]

Aaaaah Prasi my craving is finally satisfied no more AL125 dt's

 

[anti]

So are you staying at 80V rails or going up? Imho one could drop-in a MJE340 as a VAS and try his luck with 100V rails. Will it go "boom?"

And a tune to go with your renewed disco fever:
YouTube

 

[prasi]

Apex Retro Amp
1. Prasi 2 nos
2. Member (nareshn) thro PM 2 nos.
3. Bix 2 nos.
4. avtech23 2 nos.

16 PCBs remain.

got the pcbs made to spec.70um Cu. ready to ship out.
Pl let me know your paypal via PM along with full postal address. Will send an invoice. For Indian member, it will be bank transfer.

Next step, Mouser BoM for Bix.

regards
Prasi

 

[prasi]

got the pcbs made to spec.70um Cu. ready to ship out.
Pl let me know your paypal via PM along with full postal address. Will send an invoice. For Indian member, it will be bank transfer.

Next step, Mouser BoM for Bix.

regards
Prasi

Hi Bix,
Mouser BoM attached. Please add all components and share your cart here, so someone could suggest corrections, if any.
R8' trimmer is for bias adjust to 43mA (~20mV across R18). It might be better to replace the R8 after bias adjust with a fixed resistor R8.
regards
Prasi

 

[Bix]

Fantastic Prasi, thank you very much. I’ll look over the bom this weekend, I’m super busy at work at the moment. Really looking forward to building this and a few others this winter. I’ve got plenty of projects lined up so I’m gonna be a busy boy.

 

[avtech]

Hi Prasi,

The BoM seems to be missing the following:

R22-R30
C13-C14
D5-D6
T5-T9
Q3-Q4

 

[prasi]

Hi Prasi,

The BoM seems to be missing the following:

R22-R30
C13-C14
D5-D6
T5-T9
Q3-Q4

Hello avtech23,
Sorry, here is the schema and layout. Which one are you referring to?
I will try to check this again some time later.

regards
Prasi

 

[prasi]

Hello avtech23,
I rechecked the bom again, it appears to be correct. If you find anything amiss, do let me know.
regards
prasi

 

[avtech]

Ah ok, I was looking at the schematic on post 325

Retro Amp 50W Single Supply

 

[Vrystaat]

I think Thimios is most probably almost finished with his build !!

 

[gannaji]

Dear Prasi,
Please see mod by wahab at post #138.

 

[prasi]

I think it was tested by mouna and he decided to keep the apex original schema.

 

[maouna]

I think it was tested by mouna and he decided to keep the apex original schema.

yes indeed. i found original apex design better sounding to me.my only modification was to exclude the two diodes and resistor and add a vbe multiplier with bd139 mounted on same place with output device.
I dont have the amp any more but i will build it again..my only concern is to use 2N3773 or 2SC5200..i dont know which ones would sound better..

 

[prasi]

Thank you maouna for your reply. In my BoM I have kept MJL4281 as o/p device. I am also going to use MJL21194 if I am not satisfied, although I very much doubt these devices to make any difference.

 

[Bix]

Hey Prasi, thanks for the BOM. Now, dumb question, do I manually go through each part and then purchase through mouser or can I import the entire list? Sorry for the silly question but I can’t see import option at mouser. What am I doing wrong? Duh

Edit: I found it. I new I would feel stupid posting this just as I hit the submit button