Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Colas LeGrippa on February 06, 2020, 06:03:12 pm

Title: Old f....radio revisited.
Post by: Colas LeGrippa on February 06, 2020, 06:03:12 pm

Hola mi friends,


A friend of mine (sometimes I have the feeling that I am experiencing one way friendship....)
 called me to fix his vintage radio. (I must learn to say NO. Next time I will, promised. ).


First of all, I don't know a single tube in there.
I am old but not THAT old. The problem is a pulsating sound like a vibrato without the guitar sound.( I had modded it a couple years ago for guitar, in fact I just had to put a guitar 1/4 imput and reroute the opt wiring). But this is not.my main concern. This "friend" wants me to install a 3 prong a/c supply cord while one side of the 6.3vac heaters is already tied to gnd. The PT has a center tap tied to gnd as well. I never coped with heaters wiring like that. Can I just ty the chassis to gnd or no ?

Title: Re: Old f....radio revisited.
Post by: sluckey on February 06, 2020, 06:28:05 pm

yes

Title: Re: Old f....radio revisited.
Post by: Colas LeGrippa on February 06, 2020, 06:38:30 pm

Short and sweet.
Thanx