Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: etneccas on August 24, 2019, 08:44:48 am

Title: Dialing in a 5e5a build
Post by: etneccas on August 24, 2019, 08:44:48 am

What are some of the tweaks or things I should check to dial in a 5e5a build? I want to make the low end tight and punchy and just overall more responsive?

Title: Re: Dialing in a 5e5a build
Post by: DummyLoad on August 24, 2019, 03:09:28 pm

closed back speaker cabinet / different speaker(s).

reduce 100K NFB resistor value. experiment - 91K, 82K, 68K, etc.

swap 16uF main filters with 30-32uF filters.

do you know the inductance value and current rating of the choke used?

--pete

Title: Re: Dialing in a 5e5a build
Post by: etneccas on August 26, 2019, 07:14:59 am

[quote author=DummyLoad

“do you know the inductance value and current rating of the choke used? “

--pete

Hammond 193h 5h@200ma
The build originally came with a Mojo 777
Which to come think of it sounded amazing
but I was advised that it was under sized and would burn up. So I could either change the location from being in series to the taps on the output transformer or put a bigger choke in
and I went with bigger choke and it totally changed the feel.....