Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: basschops1528 on June 19, 2016, 07:17:47 am

Title: Hoffman 100 watt plexi
Post by: basschops1528 on June 19, 2016, 07:17:47 am

Would someone be able to point me in the right direction for a schematic for Doug's 100 watt plexiglass board? I had been using his layout AND the following schematic below but I don't think it appropriately shows the differences in the presence circuits, the way Sluckey mentioned. I'm trying to see how Doug's layout (which causes DC on the pres pot) compares to the one Sluckey gave me (no DC on pres pot). I need to see it to understand it.

Title: Re: Hoffman 100 watt plexi
Post by: drgonzonm on June 19, 2016, 08:41:03 am

Pls post schematic

Thx

Title: Re: Hoffman 100 watt plexi
Post by: basschops1528 on June 19, 2016, 09:17:31 am

Here

Title: Re: Hoffman 100 watt plexi
Post by: sluckey on June 19, 2016, 10:08:55 am

Quote

Would someone be able to point me in the right direction for a schematic for Doug's 100 watt plexiglass board?

There isn't one that I know of. Only a layout. But the NFB circuit with Presence pot is exactly the same as his Plexi 50 so just use the Plexi 50 schematic to compare to the schematic you posted.

Title: Re: Hoffman 100 watt plexi
Post by: sluckey on June 19, 2016, 01:37:20 pm

side by side...

Title: Re: Hoffman 100 watt plexi
Post by: basschops1528 on June 19, 2016, 02:41:36 pm

Thanks Sluckey.

I see it now. Also appreciate the side by side.