Trainwrecking a 50w Marshall type amp suggestions

[Reeltarded]

That amp only sounds like Van Hefflin if you are playing Van Hefflin licks with a Van Hefflin touch.

I am Wrecking a '69 Major.

[RJ Guitars]

too evh sounding.

Sounds like the kind of trouble I would like to have? Supposedly Eddies signature sound came from a 100W Marshall's and the quest has been to recreate that in the various iterations of his builds... Sorry to derail.

I am curious about Mr. Fowler's mention of the Komet? Is that pretty close to the desired circuit mentioned in the original post?

rj

[LeftyStrat]

I am curious about Mr. Fowler's mention of the Komet? Is that pretty close to the desired circuit mentioned in the original post?

rj

Pretty much, Komet 60 is very similar. The Komet 50 or Concorde uses the left-over triode as a cathode follower feeding the PI. And it's not there to provide a low impedance source.

[hans-jörg]

I am curious about Mr. Fowler's mention of the Komet? Is that pretty close to the desired circuit mentioned in the original post?

rj

Pretty much, Komet 60 is very similar. The Komet 50 or Concorde uses the left-over triode as a cathode follower feeding the PI. And it's not there to provide a low impedance source.

[hans-jörg]

I am curious about Mr. Fowler's mention of the Komet? Is that pretty close to the desired circuit mentioned in the original post?

rj

Pretty much, Komet 60 is very similar. The Komet 50 or Concorde uses the left-over triode as a cathode follower feeding the PI. And it's not there to provide a low impedance source.

so than whatfor?

Hello,
can somebody tell me if there is something more than the CF at the 4th triode. Like 3k3 at the 3rd cathode instead of 10k. At the picture of Komet ar sveral resistors in this area wich I cannot identificate.
The CF goes with 100k to ground, right?

As I see, the only different between 60 and Concord is: the 60 has tube rectifying, the Concorde not but a 3k3 at 3rd cath. and the CF with 100k to ground. Why there should be a different from 10 watts between them (60 = 60watt, Concorde = 50watt). Power amp tubes are the same = EL34.
I built up now the Concorde version and it sounds good. But I cammot figure out a different betw. 60 and C.

Hans-Jörg

[Colossal]

Why there should be a different from 10 watts between them (60 = 60watt, Concorde = 50watt). Power amp tubes are the same = EL34.
I built up now the Concorde version and it sounds good. But I cammot figure out a different betw. 60 and C.

Hans-Jörg

Hans,

The difference between the K50 and K60 is solid state rectified vs. tube rectified. Also, the K50 has a 4k8 load line where the K60 is 5k8. Rotating the load line will change the apparent power. The K50 uses a cathode follower which will slightly increase the gain of the preceding stage (as well as contribute tonal differences) and pushes the phase inverter harder.

[hans-jörg]

Why there should be a different from 10 watts between them (60 = 60watt, Concorde = 50watt). Power amp tubes are the same = EL34.
I built up now the Concorde version and it sounds good. But I cammot figure out a different betw. 60 and C.

Hans-Jörg

Hans,

The difference between the K50 and K60 is solid state rectified vs. tube rectified. Also, the K50 has a 4k8 load line where the K60 is 5k8. Rotating the load line will change the apparent power. The K50 uses a cathode follower which will slightly increase the gain of the preceding stage (as well as contribute tonal differences) and pushes the phase inverter harder.

Colossal thanks,
this CF can push the PI harder than the orig. TW stage of let say Express? I thought, there is not more possible
Btw. allthough the cathode of the 3rd stage is only 3k3 - or because of ..?

Hans-Jörg

[Colossal]

Colossal thanks,
this CF can push the PI harder than the orig. TW stage of let say Express? I thought, there is not more possible
Btw. allthough the cathode of the 3rd stage is only 3k3 - or because of ..?

Hans-Jörg

The cathode on the 3rd stage in the K50 (3k3 = K50, 10k = K60, Express) is warmer biased but will still introduce clipping when driven. Also, it should be noted that the voltage divider on the K60 immediately preceding that 3rd stage is different than the K50 so this will change how the stage responds in the K50 as compared with the K60 and Express.

[hans-jörg]

Colossal thanks,
this CF can push the PI harder than the orig. TW stage of let say Express? I thought, there is not more possible
Btw. allthough the cathode of the 3rd stage is only 3k3 - or because of ..?

Hans-Jörg

The cathode on the 3rd stage in the K50 (3k3 = K50, 10k = K60, Express) is warmer biased but will still introduce clipping when driven. Also, it should be noted that the voltage divider on the K60 immediately preceding that 3rd stage is different than the K50 so this will change how the stage responds in the K50 as compared with the K60 and Express.

Oh.Ok, that means I´ve the wrong circuit in. I done first the K60 and than I implemented the CF with the 3k3. What kind of changes are there more on the 50? Is there still the 220k/330k to ground (in Express is there only 150k to ground). Is here a schem for the 50 available? I´m DIY builder or at least: how looks the voltage divider?

Thanks

Hans-Jörg

[Colossal]

What kind of changes are there more on the 50?

Check your PM

[hans-jörg]

Thanx Dave

[My-Co]

Just sell what you have, and buy the real deal. Trainwreck.com ask for JM

[M Fowler]

Why pay JM or Hogy for what I can build myself