heart break

[Andy Le Blanc]

I just discovered that the little circuit I've been hot to work up on the bench, is in actuality, a rehash of a horizontal sweep oscillator. Mid 50's TV.
Bettie White's hot fuzz,...

[Phil_S]

I feel your pain. Regrettably, it's been said, there is nothing new under the sun. Sometimes, it is hard to remember that.
I've given up on hatching an original idea.

[Andy Le Blanc]

Yes, this is very true. I like looking for the history, development and application of circuits. This particular is applied directly to a Garnet,..and carries into Train Wreck designs. It also follows into early tube analog computing circuits. The development of "television" led the way for a lot of things. I stumbled over a PDF of a trade rag publication, and after a couple schematics I had an "O jeez", there it is.

[TUBEDUDE]

Much has been done in a hundred years of vacuum tube circuitry, but not everything. Look over the hundreds of articles from John Broskie on his site "Tube CAD Journal". Many original ideas and circuits. He has some great insights and explains the circuits clearly. A very bright lad.

[Colossal]

Much has been done in a hundred years of vacuum tube circuitry, but not everything. Look over the hundreds of articles from John Broskie on his site "Tube CAD Journal". Many original ideas and circuits. He has some great insights and explains the circuits clearly. A very bright lad.

Yeah, Broskie's stuff is interesting reading for sure. I am curious about the Aikido cathode follower, specifically as a SE driver, but also for the PS ripple canceling feature of the lower triode (but I wonder if it might be too clean?)

[TUBEDUDE]

Have you seen his pentode ripple reduction strategy? He takes the plate signal and injects a small amount into the screen grid. So the out of phase 60 Hz. is greatly reduced.

[Colossal]

Have you seen his pentode ripple reduction strategy? He takes the plate signal and injects a small amount into the screen grid. So the out of phase 60 Hz. is greatly reduced.

No, I haven't seen that one. I'll have a look. Sounds interesting. Have you tried it? Seems like that would be useful with a pentode set to high gain.

[Andy Le Blanc]

Ahhh.... that aikido pre. Great pre, really good for hifi but not so much for guitar. A bass amp might be the best application, you need the bandwidth and clean drive there.
SRPP, MU-followers and cascoded pre are almost too revealing in the mid, high mid and top end. Hi-Watt had a similar approach, that follower with the voltage divider between the power rail and chassis ground.
And it uses only 1 valve section.

[Colossal]

Ahhh.... that aikido pre. Great pre, really good for hifi but not so much for guitar. A bass amp might be the best application, you need the bandwidth and clean drive there.
SRPP, MU-followers and cascoded pre are almost too revealing in the mid, high mid and top end. Hi-Watt had a similar approach, that follower with the voltage divider between the power rail and chassis ground.
And it uses only 1 valve section.

Good to know, Andy. I was wondering about that. Some AC ripple has been shown as essential to what we consider guitar tone. This article shows what happens when the classic Bassman power supply was regulated. It killed the amp.

https://www.ampbooks.com/mobile/classic ... AB-ripple/

I am curious however about the effects of the Aikido follower as a driver for a big, multi-bottle SE output stage.

[didit]

Recall reading that report at least once in the past, then muttering something like "controlling for resistance is not the same as controlling for power supply impedance" before moving on with my day.

Best .. Ian

[TUBEDUDE]

I'm using the Aikido stage in my turntable preamp, it's great. I won't need it in a guitar amp.
I have used the screen grid trick on all my builds that have a 5879 in them. Basically you just reference the screen cap to the plate, instead of the cathode.

[Colossal]

I'm using the Aikido stage in my turntable preamp, it's great. I won't need it in a guitar amp.
I have used the screen grid trick on all my builds that have a 5879 in them. Basically you just reference the screen cap to the plate, instead of the cathode.

Awesome, good to know. I'll just stick with a regular CF driver, if I go that route.