Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => PC Express and JSchem - Schematics and Layout diagrams => Topic started by: Watto on August 23, 2015, 07:40:46 pm

Title: Blonde Twin 6G8 with Reverb
Post by: Watto on August 23, 2015, 07:40:46 pm

Hi All,
I've always loved the short lived Harmonic Tremolo/vibrato that came with some of the Blonde/Brown series amps.
I also love some reverb in there as well, so I set about trying to figure out how to fit it all into one amp.

Here's my first attempt, It's basically a 2 output tube 6G8 Twin with the Fender reverb .
I have just finished this drawing and called it the Harmonic Reverb, I haven't yet built it (waiting on parts ) but will do in the near future
I thought I'd post it here for all to check out. I've gone over the circuit multiple times and as far as I can see it's correct . I'm hoping the guru's here can take a look and see if there's something I've missed . This is a work in progress, untested, so don't take it as gospel. I still need to build one and sort any issues that may arise that I might have missed.

I couldn't fit the drawing on one page without you needing a magnifying glass so I split it into 2 sections.
Your input and feedback on the amp would be greatly appreciated. I've done the layout in the Hoffman board style

kind regards
Mark Watson

Preamp - reverb section
(http://i20.photobucket.com/albums/b210/amwatts/Amwatts%206G8%20Reverb%20Input%20_zpsipvkpwbg.jpg) (http://s20.photobucket.com/user/amwatts/media/Amwatts%206G8%20Reverb%20Input%20_zpsipvkpwbg.jpg.html)
Output - trem section
(http://i20.photobucket.com/albums/b210/amwatts/Amwatts%206G8%20Reverb%20Output_zpsfcndokos.jpg) (http://s20.photobucket.com/user/amwatts/media/Amwatts%206G8%20Reverb%20Output_zpsfcndokos.jpg.html)

Title: Re: Blonde Twin 6G8 with Reverb
Post by: sluckey on August 23, 2015, 08:43:29 pm

A schematic would be more useful to determine if the circuit is workable.

Title: Re: Blonde Twin 6G8 with Reverb
Post by: Watto on August 23, 2015, 10:41:20 pm

Quote from: sluckey on August 23, 2015, 08:43:29 pm

A schematic would be more useful to determine if the circuit is workable.

I'll draw one from my notes when I get a chance

Title: Re: Blonde Twin 6G8 with Reverb
Post by: Watto on August 27, 2015, 02:52:50 am

here you go,

I took one channel and 2 output tubes out of this

(http://i20.photobucket.com/albums/b210/amwatts/Single%20Channel%206g8a%20schem_zpsmmjlkfkd.jpg) (http://s20.photobucket.com/user/amwatts/media/Single%20Channel%206g8a%20schem_zpsmmjlkfkd.jpg.html)

and added this

(http://i20.photobucket.com/albums/b210/amwatts/ab763%20reverb%20schem_zpsavsdlifa.jpg) (http://s20.photobucket.com/user/amwatts/media/ab763%20reverb%20schem_zpsavsdlifa.jpg.html)

one mistake pointed out is the tube labeling, I put the 12AU in the wrong spot

Title: Re: Blonde Twin 6G8 with Reverb
Post by: jojoyouknowwink on October 25, 2024, 01:00:45 pm

Watto -- I'm looking to build an amp a lot like what you described. Your Photobucket links are dead. Do you still have your schematics? Did your project turn out?