latest edition of my version of the ST120

here is my latest version of the ST120, and hopefully, if I can keep my fingers off it.. ....lasting version...for now!
This amp uses an 'all in one' pcb, driver tubes, rectifiers and power tubes all on one large pcb, with a separate power supply cap pcb.
Sounds awesome, as is expected from the ST120.
Driver tubes are NOS 6SN7's, rectifiers are 2x Compactron 6CG3 single diode tubes and power tubes are the KT120...of course!

Well, that is ELEGANT. I want it.
What are the chassis dimensions?

Kentley wrote:Well, that is ELEGANT. I want it.
What are the chassis dimensions?

thank you. Yeah, I think I finally got the layout right! Chassis is 15 1/8"w x 11 7/8" deep

I like it!

Great work, MontanaWay

Looks great! Very elegant. FYI, I've read that power tubes mounted to pcbs can be problematic in the long run.

That's flat effin gorgeous.

Thanks for the pic..............Vary Nice...........How much for the 2H Choke?....






thanks for the site Bob.................

corndog71 wrote:Looks great!  Very elegant.  FYI, I've read that power tubes mounted to pcbs can be problematic in the long run.  

yes, I'm pretty sure I got that covered. Vent holes under the tube sockets, extra wide pcb tracks and double thickness pcb

zx wrote:Thanks for the pic..............Vary Nice...........How much for the 2H Choke?....






thanks for the site Bob.................

can't remember the choke price, go to Edcor's web site, it'll be there

MontanaWay wrote:

corndog71 wrote:Looks great!  Very elegant.  FYI, I've read that power tubes mounted to pcbs can be problematic in the long run.  

yes, I'm pretty sure I got that covered. Vent holes under the tube sockets, extra wide pcb tracks and double thickness pcb

If you notice Holger's PCBs, there are tube sockets all the way around.
There are some PCBs (not his) that you solder tubes directly in to, thus facilitating heat transfer to the boards and concomitant problems. This would not be an issue, IMHO, with discreet sockets. Plenty of heat-sinking there to go around, as the heat dissipates thru the socket rather than onto the board.

deepee99 wrote:

MontanaWay wrote:

corndog71 wrote:Looks great!  Very elegant.  FYI, I've read that power tubes mounted to pcbs can be problematic in the long run.  

yes, I'm pretty sure I got that covered. Vent holes under the tube sockets, extra wide pcb tracks and double thickness pcb

If you notice Holger's PCBs, there are tube sockets all the way around.
There are some PCBs (not his) that you solder tubes directly in to, thus facilitating heat transfer to the boards and concomitant problems. This would not be an issue, IMHO, with discreet sockets. Plenty of heat-sinking there to go around, as the heat dissipates thru the socket rather than onto the board.

not to mention heat rises..... ......but I guess time will tell, but I did read up on that issue with older pcb designs and what can be done to overcome heat stress on the pcb, and made sure I've done everything to alleviate such issues down the track.....

Yes, I have noted that heat rises in my home, and it's not always due to the electronics. Just forget to haul out the trash.

Killer! Great job

I cannot applaud this enough!  Having just learned DesignSpark PCB to create my own PCB's I know how much work is involved.  What design software did you use?

And is the Cap Board your design also?

Bravo!

tomlang wrote:I cannot applaud this enough!  Having just learned DesignSpark PCB to create my own PCB's I know how much work is involved.  What design software did you use?

And is the Cap Board your design also?

Bravo!

thank you!
I use Copper Connection, it is simple yet very powerful, and allows me to import non Gerber files and convert them to Gerber!
Yes, the cap pcb power supply is also my own design.

Holger, that's a thing of beauty!

Tube Nube wrote:Holger, that's a thing of beauty!

You ought to see what two of them look like (M-125s/Big Boppers), side by each . . .
"Cabin crew, secure the aircraft for take-off."

Really sweet looking with the VU meters.