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Old 5th June 2007, 06:47 AM   #21
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Thanks, got it!

I have stash of C3m and C3o tubes to experiment with during the summer.
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Old 26th October 2008, 07:55 AM   #22
Dr.X is offline Dr.X  United Kingdom
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Default Couple of C3m questions...

Hi,
I have a couple of questions re. triode-connected C3m if anyone could help...

1] Triode-coupled, what's the approx. amplifcation factor?

2] How do they sound? Specifically, compared to the Russian 6c45 or similar?

Many thanks!
Doc
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Old 26th October 2008, 08:02 AM   #23
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Default Re: Couple of C3m questions...

Quote:
Originally posted by Dr.X
...
1] Triode-coupled, what's the approx. amplifcation factor?...

Depends of the circuit..., g1/g2 = 19.

Andreas
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Old 26th October 2008, 08:12 AM   #24
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AndreasS, hope you will take a minute to answer a simple question since you obviously know this tube well:

Is the Ri in triode mode around 2k?
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Old 26th October 2008, 09:01 AM   #25
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The Ri (triode mode) is shown on datasheet page 17

http://frank.pocnet.net/sheets/009/c/C3m.pdf

For the operation point @ 16 mA Ri is around 2,5 kOhms

Andreas
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Old 26th October 2008, 01:32 PM   #26
Dr.X is offline Dr.X  United Kingdom
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Default Re: Re: Couple of C3m questions...

Quote:
Originally posted by AndreasS



Depends of the circuit..., g1/g2 = 19.

Andreas

Thanks Andreas
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Old 27th October 2008, 07:42 AM   #27
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Quote:
Originally posted by AndreasS
The Ri (triode mode) is shown on datasheet page 17

http://frank.pocnet.net/sheets/009/c/C3m.pdf

For the operation point @ 16 mA Ri is around 2,5 kOhms

Andreas
Thanks a lot AndreasS!

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Old 28th October 2008, 03:04 AM   #28
mach1 is offline mach1  Australia
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bequerel,

to determine the plate resistance of any tube at any operating point, plot the operarating point on the plate curves, then draw a line tangential to the curve that runs through your operating point. The slope of that line (delta V over delta I) is the plate resistance.

Easy !
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Old 28th October 2008, 07:51 AM   #29
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Quote:
Originally posted by mach1
bequerel,

to determine the plate resistance of any tube at any operating point, plot the operarating point on the plate curves, then draw a line tangential to the curve that runs through your operating point. The slope of that line (delta V over delta I) is the plate resistance.

Easy !
Thanks, I will print out your reply and save in my drawer.
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Old 12th April 2009, 03:51 PM   #30
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i would like to build one myself. have the siemens tubes in my drawer.

got any schematic to share? TIA

erwin
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