D-lator in amp chassis finish

[sergio]

Hi , I finish my D-lator and this are my voltages:

Drive side: 258V / 29V
Recovery side: 228V / 1,8V

I seem this voltage ok
comment are appreciated

Thanks
Sergio

[Tonegeek]

Hi , I finish my D-lator and this are my voltages:

Drive side: 258V / 29V
Recovery side: 228V / 1,8V

I seem this voltage ok
comment are appreciated

Thanks
Sergio

Seems ideal

[glasman]

They look very good.

It is good to have the headroom on the cathode follower. That is nasty a$$ sounding clipping that can occur at that stage.


I keep thinking I am going to tweak that circuit for a 12AT7 for a future amp. The 12AX7 really limits the BW. With an AT7 you can take the response from DC to Daylight.

Gary

[Bob-I]

They look very good.

It is good to have the headroom on the cathode follower. That is nasty a$$ sounding clipping that can occur at that stage.


I keep thinking I am going to tweak that circuit for a 12AT7 for a future amp. The 12AX7 really limits the BW. With an AT7 you can take the response from DC to Daylight.

Gary

What values would you modify?

[glasman]

On the CF if would the cathode and bootstrap to rebias the tubes. On the recovery side I would dump the FB, drop the input resistor value a bit and change the cathode resistor to get the proper bias level.

For the actual values I would have to sit down with the tube data and work out the required "R" changes.

Gary

[BobW]

Gary, since there seems to be sufficient gain do you see any advantage going to a 12AU7 as well? Am thinking in terms of less gain vs. more bandwidth but don't have the data sheets at hand (until I get home).