Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Sonny ReVerb on September 22, 2020, 10:12:26 pm

Title: Three wire choke
Post by: Sonny ReVerb on September 22, 2020, 10:12:26 pm
I'm working on a tweed Super project. I've been looking at a lot of pics of original Supers for reference. I'm curious as to why this choke has three wires coming out of it? (Yes, that's the choke, not the OT.)

Title: Re: Three wire choke
Post by: sluckey on September 22, 2020, 10:55:30 pm
I'm working on a tweed Super project. I've been looking at a lot of pics of original Supers for reference. I'm curious as to why this choke has three wires coming out of it? (Yes, that's the choke, not the OT.)

I disagree. That's the OT. Follow the blue and brown wires. Bet they go to pin 3 of the 6L6 sockets.

Look at this short video...


Title: Re: Three wire choke
Post by: Latole on September 23, 2020, 03:04:16 am
Where do you see a 3 wires choke on schematic ?

Choke is alway smaller than a O.T


http://ampwares.com/schematics/super_5f4.pdf
Title: Re: Three wire choke
Post by: EL34 on September 23, 2020, 06:21:23 am
I'm curious as to why this choke has three wires coming out of it? (Yes, that's the choke, not the OT

That's the OT, not the choke
The small one is the choke
Title: Re: Three wire choke
Post by: Sonny ReVerb on September 23, 2020, 11:58:41 am
Well, y'all are right, of course. I stand corrected. Those are the red, green, and brown wires from the OT shown on the layout. I was fooled because most of the replica builds I've seen pics of show the choke between the OT and PT. Also, this amp has an abnormally large choke because it has to handle the current of the power tube plates.
Title: Re: Three wire choke
Post by: sluckey on September 23, 2020, 01:02:44 pm
Also, this amp has an abnormally large choke because it has to handle the current of the power tube plates.
Big current does not always translate to big physical size. Look at the size of this choke. It has to handle plates for 2 6550s.

     http://sluckeyamps.com/sunn/sceptre1.jpg
Title: Re: Three wire choke
Post by: Latole on September 23, 2020, 01:03:19 pm
You are right, most of the time, choke are between PT and OT

But all the time, choke have only 2 wires  :laugh: