Better bass response

[newguitarsmell]

Hey all
I modified a 5f2a to use with keys - put in a huge OT - - a nice big speaker but the bass response is a bit flat. Maybe I'm asking too much of a single ended 5Watter?
The tone control helps kick out the top end but it needs more.
https://el34world.com/Hoffman/files/Hoffman_5F2A.pdf

Nice and quiet though - sounds great overall I am happy with it. Just wondering. Haven't checked in for awhile.

[sluckey]

Maybe I'm asking too much of a single ended 5Watter?

Most likely.

[newguitarsmell]

Sluckey - you would know!

[Leevi]

Add a cathode bypass cap to the second stage.
Cut the NFB.


/Leevi

[pdf64]

Add a cathode bypass cap to the second stage.
Cut the NFB.

A fully bypassed 2nd stage cathode would disable the NFB loop (which would tend to result in a brighter sound due to the amp’s output then tracking the load impedance).
Whereas a partial bypass would actively boost higher frequencies (eg same as a presence control on max)

[Leevi]

A fully bypassed 2nd stage cathode would disable the NFB loop (which would tend to result in a brighter sound due to the amp’s output then tracking the load impedance).Whereas a partial bypass would actively boost higher frequencies (eg same as a presence control on max)

This is true but I think the cap value affects the frequency? A small cap gains high frequencies and a big cap low frequencies?
Furthermore the overall loudness will increase which highlights the bass as well.


/Leevi