CCS and high plate R vs CCS etc the why is it ... - wlee - Tube DIY Asylum

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CCS and high plate R vs CCS etc the why is it ...

wlee

I have problem understanding CCS and soon will try 10M45 and Penthode as CCS for some of my amps.
When a CCS is placed atthe plate, since constant current, the dv/di is approaching infinity. So:
1. the approximation thet the gain of the stage is Plate R/Cathode R does not work any more. Should teh gain be the same as the mu of the tube, or similar to starvation condition?
2. Since this is just AC condition, will the gain be freq dependent/
3. As the tube is converting input voltage to current flow between the plate and cathode, which is AC in nature, how could then di=0? unless there is grid current.
4. In long tail pair or output stage, if we place the CCS at the cathode, how do we calculate the gain? also why do we want high impedence at the cathode now?
I know CCS worked, just curious. ALl these questions ha sprevebnted me from trying it out. But some of the respected minds have suggetsed that I should give it a try. So I hope to have an open discussion here.
tks and best rgds
William Lee

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Topic - CCS and high plate R vs CCS etc the why is it ... - wlee 12:44:50 07/02/06 (10)

It may help to look at CCS this way ... - Naz 19:21:54 07/02/06 (2)

Re: It may help to look at CCS this way ... - wlee 11:07:15 07/05/06 (1)

Re: It may help to look at CCS this way ... - Naz 22:24:12 07/05/06 (1)

Re: CCS and high plate R vs CCS etc the why is it ... - Bill Barrett 16:21:54 07/02/06 (0)

Re: CCS and high plate R vs CCS etc the why is it ... - Bill Barrett 16:16:14 07/02/06 (0)

For a bunch of really good info - Russ57 15:06:52 07/02/06 (1)

Re: For a bunch of really good info - wlee 11:03:36 07/05/06 (0)

Re: CCS and high plate R vs CCS etc the why is it ... - Dave Davenport 13:12:18 07/02/06 (1)

Re: CCS and high plate R vs CCS etc the why is it ... - wlee 11:01:16 07/05/06 (0)

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