Simple tube shunt ripple remover (or too simple?)

[Chris Hornbeck]

There's a world of difference between the circuit in post #1 and the 1937 article in post #10. For one, there's an order of magnitude difference in the size of the anode-grid capacitor. In the original, and strangely uncredited (have I missed it?) 1937 article, the intention was clearly to make a capacitance multiplier, which would have been worthwhile before the war, when capacitors were difficult and expensive. The article was poorly framed and misleading, but the modern "interpretation" of it is just wrong with no redeeming features.

Lots of stuff from 1937 is beautiful. Hard times make great art. An ancient Chinese curse goes "May you live in interesting times."

All good fortune,
Chris

 

[Windcrest77]

The ripple killers I saw before have the adjustable resistor in the connection between the 0.1 uF (or an other value) capacitor and the plate connection.

The schematic on page 27 also shows the adjustable resistor at that position: Electronics June 1937

Thanks this is a nice article, 1937 Akido mojo! But the max plate voltage of 6A6 is 300V, this is across 400V? Just getting started learning spice, this is a good practice thing to model to answer my own question!

https://frank.pocnet.net/sheets/127/6/6A6.pdf

 

[jhstewart9]

Aren't the HV, HI mu triodes in the sweep circuits of the early era TVs something similar?
For example 6BK4.

 

[PRR]

But the max plate voltage of 6A6 is 300V, this is across 400V?

Schade worked for RCA. As a major mucky-muck researcher. And television development was important. (Had to beat-back the Farnsworth patents.) "300V" 6A6 will stand 400V for quite a while. If not forever, long enough to not drain RCA's resources.

 

[Elvee]

Using a dual tube (and a not too simple circuit), it is possible to achieve performance levels comparable to semiconductor circuits:

For higher voltages, the components need to be adapted obviously

 

[Windcrest77]

Using a dual tube (and a not too simple circuit), it is possible to achieve performance levels comparable to semiconductor circuits:

View attachment 1025465

For higher voltages, the components need to be adapted obviously

Thanks! A newby learning a lot here, I was starting to model this (newby spice) starting back at the power supply. But I see one can just superimpose whatever kind of noise you need onto the DC then see how well the circuit cancels it, very cool.

 

[ruffrecords]

Here is a youtube video which covers the technique. Start at 6 mins:

Cheers

Ian