Stan Curtis 60W Class A

[musette0000]

Hi, I translated with google translate and it looks like it translated wrong. I mean, I owe it to myself.

 

[PID1]

Hi,
I own a set of original Lecson AP4's, and the Jeremiah Braithwaite pre that goes with them. They are stunningly good amps and thanks to some help from Stan Curtis they are still going strong.
Way ahead of their time and can still hold their own.

 

[61051]

let me check for you

Hi Nick,
do you still have some of your PCB's for this Amp available?
Kind regards
Joe

 

[61051]

Nick

I have the original magazine with the full article for the pre and power amps including the pcb artwork. I will also add the updates that Stan Curtis published a year later.

I made the pre and power amps and they do sound very good. I like the design. Not unlike the Krell in sound. I have swapped out the output devices for later faster ones and that helped. I built the amps as monoblocks and added a 4" fan to each monoblock to keep them running at reasonable temperatures. The amps do run at 60 watt class A and give off a lot of heat. The pre amp also sounds good.

The overall article plus pcb plus updates is very long and I only have hard copies. If you give me your address I will post you a photo copy.


Don

Hi Don,
would you be able to send me a copy of the article, the scanned ones are quite blurred for detail.
Kind Regards
Joe

 

[61051]

Hi All,
one further Question, the parts list shows two big 15000uf caps in the PSU. Is there any benefit to replacing these with smaller caps in parallel as in the EC25 power amps?

 

[Bonsai]

If anyone is still looking for the original articles, here they are

https://hifisonix.com/stan-curtis-60w-class-a-amplifier-fro-eti/


Link to his website here http://www.stancurtis.com/index.htm

 

[61051]

Bonsai,
many thanks for posting the information.
Joe

 

[61051]

Hi,
I own a set of original Lecson AP4's, and the Jeremiah Braithwaite pre that goes with them. They are stunningly good amps and thanks to some help from Stan Curtis they are still going strong.
Way ahead of their time and can still hold

Hi PID1
as you own a set of these , could you answer the following for me? In the parts list Q17 is down as a MPSA06, this is the transistor attached to the points P,Q,R on the boards and apparently mounted on the heatsink. Its not the thermal cut out (TS1) which is shown on the rear panel. Can you see how this transistor is attached as its a TO92 package? The layout diagram seems to show a TO220 Package in this position, which if correct, is missing from the parts list, so if your amps have a TO220, would you mind letting me know what it is?
Many Thanks
Joe

 

[jamesfeline]

hello

yes I do .. please PM me directly
all the best

 

[jamesfeline]

do you mean this PCB ....

 

[musette0000]

thanks a lot

 

[jamesfeline]

your welcome

 

[jamesfeline]

just wondered has any members got any parts for the 60w class A amplifier .. completed amplifier or old heats sinks transformers etc
have good money waiting for the right parts
all the best

 

[Marra]

I have two pairs of 802 and 4502 output transistors which you are welcome to.

Rereading the thread I realise that we talked back in 2018 and I never did get back to you regarding things for which I apologise.

There are 12 heatsinks gathering dust in a shed measuring 120x120x115 long if of any use to you. no idea on price though.

 

[jamesfeline]

hello please send me a PM to talk more ... happy to have all you have

 

[Marra]

For some reason I can't send a PM.

 

[jamesfeline]

For some reason I can't send a PM.

strange .. let me check my settings

 

[jamesfeline]

can you email me ?

 

[Marra]

Sure.

 

[jamesfeline]

just sent a pm