Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on May 12, 2018, 12:38:49 pm

Title: Wrong wiring of the low input?
Post by: Leevi on May 12, 2018, 12:38:49 pm

I think the low input is wrongly drawn? When plugging to Low input no signal will go to V1b.
I think the tip and switch should be wired other way round?


http://nicosonic.com/sites/default/files/pics/Soldano%20HR50%20SL60%20+%20XL%20mod.jpg (http://nicosonic.com/sites/default/files/pics/Soldano%20HR50%20SL60%20+%20XL%20mod.jpg)


/Leevi

Title: Re: Wrong wiring of the low input?
Post by: sluckey on May 12, 2018, 01:14:05 pm

Yep

Title: Re: Wrong wiring of the low input?
Post by: Leevi on May 12, 2018, 02:12:24 pm

There are some other mismatches in the schematic.
The bridge rectifier cannot be grounded if the center tap is grounded.
Same thing with the heaters. 100 ohms resistors are not needed if CT is grounded.
/Leevi