Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on August 04, 2016, 06:04:25 am

Title: LCR's in Hoffman 18 w Marshall
Post by: Oddvar on August 04, 2016, 06:04:25 am

Hi.

In the build layout for Hoffman stout there are three 500 v 20uf electrolytics and one 40 uf 500 volt .
I was wondering if I could substitute thes four with two 50x50 uf 500volts?

Best. 

Title: Re: LCR's in Hoffman 18 w Marshall
Post by: sluckey on August 04, 2016, 07:23:42 am

I would not use 50µF for the first cap seen by a 5Y3. But if you use silicon diodes it will be fine.

Title: Re: LCR's in Hoffman 18 w Marshall
Post by: Oddvar on August 04, 2016, 07:55:35 am

Wher should I put those?

Title: Re: LCR's in Hoffman 18 w Marshall
Post by: tubenit on August 04, 2016, 08:10:25 am

Oddvar,

It sounds like you are wanting to have only two filter cap stages of 50uf/500v instead of the four filter cap stages of the 18w?

You will be much happier I think with four filter cap stages and have a much quieter amp.  I would stick with the original plan that Hoffman has posted.

http://el34world.com/projects/images/18WattStout_8.gif (http://el34world.com/projects/images/18WattStout_8.gif)

With respect, Tubenit

Title: Re: LCR's in Hoffman 18 w Marshall
Post by: sluckey on August 04, 2016, 08:12:50 am

Quote from: Oddvar on August 04, 2016, 07:55:35 am

Wher should I put those?

Replace the 5Y3 with diodes.

Title: Re: LCR's in Hoffman 18 w Marshall
Post by: Oddvar on August 04, 2016, 08:13:43 am

I'll stick to the original layout then...(Thanks again)