Marshall owners needed - Early PCB based models

[Turret]

Hi,

I need the dimensions of Marshall's early PCB

Specially PCB marked as ST1 iss.202, but other early ones and these before Marshall started to use PCB mounted pots will do

Thanks

[xtian]

That's mine. 1983 JCM 800 2203. I'll open mine up this afternoon.

[Turret]

That's mine. 1983 JCM 800 2203. I'll open mine up this afternoon.

Cheers mate, If you can take detailed innards shots that would be also very cool

[xtian]

Board is 297 x 80 x 1.5mm. You can see my cathode bypass mod in the first photo.

[Turret]

Oh man, too cool, seriously thank you. Now I will do some magic with it in DIYLC, if I will have some question may I PM you?

Cheers

[xtian]

May I PM you?

Sure. Note I have removed bright caps C4 and C5 shown in attached schematic. And changed R5 to 22K...um, no idea why I did that. May return it to 470K. But amp sounds damn finely.

[Turret]

When I finish doing what I'm doing you will be able to mod the shit outta it on new replica PCB. I can do custom PNP for you as well with onboard mods of your choice - I owe you after all

[martin manning]

Nice pics, xtian... excellent documentation for this amp!

[Turret]

Great picts indeed

Marshall turretboard era amps are quite well documented, not much replica layouts for PCB era amps... Well, at least until soon

Work in progress

[M Fowler]

Very good timing I just had a conversation with Colossal about Marshall PCB's and that no one has them available that I know of.

Mark

[Turret]

Group buy?

[Colossal]

I would be up for providing a Marshall style PCB which allows for standard Marshall builds, but also added functionality so guys could add additional gain stages, mods, etc, but I would not do it as a clone of the original ST1 style boards. If enough people were interested, it would bring the cost of the board down to make it viable.

[M Fowler]

I'm with you Colossal Dave.

[rp]

Group buy?

I'm in. I'd love a 2203/4 pcb board, actually googled around but there are none anywhere. Made the same for box caps like Wimas hopefully, wanna use sozo go elsewheres Been waiting a while for someone here to come up with it. If you do it PM please as I may not catch the post.

BTW doubt you'd retire on it but I'd bet you'd make yourself some extra xmas money on ebay.

[Turret]

Thanks RP, but I don't think it will be finished before X-mass. Also I don't want to make living from PCB trading/manufacturing/design - although is would be quite cool, but I may get around 10 pcs made. If they won't sell, I will make good use of them anyway one day

The progress is slow, lack of time, lot's of shitstorms at work and in my social life, but I think I should have it done before the end of January. Of course all files will be published here, and you and others always can make your own, but little sell will only inspire me to do more projects in future and do them more often

Anyway, preview attached. PNP will come in set with full amp layout and matched schematics (component values & numbers)

Cheers for now