Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: rvaughan on April 18, 2023, 07:42:51 am

Title: 5F6A Build
Post by: rvaughan on April 18, 2023, 07:42:51 am

Investigating doing a Bassman 5F6A build and want to incorporate a couple of the Robinette mods, adjustable bias and master volume.  I want to use a turret board instead of eyelet and was wondering where I could find the dimensions for eylet/turret spacing to compare the Robinette, Hoffman and standard Fender layouts.  I wanted to see what kind of room there is for bias and balanced bias pots.

Title: Re: 5F6A Build
Post by: sluckey on April 18, 2023, 08:52:33 am

Hoffman's board is 10.5" x 3.125". Bias pot is on the board. The board is pretty full but there "may" be room to add a balance trim pot. His layout is quite different (in a good way) from the original.

Rob's board looks identical to the original.

If I was building this, I would use Hoffman's turret board and forget about bias balance. Cost $34 with turrets installed.

Title: Re: 5F6A Build
Post by: acheld on April 18, 2023, 10:11:43 am

Quote

If I was building this, I would use Hoffman's turret board and forget about bias balance.

That's what I did, and it's a great amp.  Hoffman's layout is the right stuff.  No need to get complicated with this circuit.  It just works.