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Old 22nd May 2011, 06:52 PM   #41
M Gregg is offline M Gregg  United Kingdom
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The only info I could find on types was:

6C33C, 6C33C-B

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Old 22nd May 2011, 07:02 PM   #42
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Whatever type you end up with, They'll be fine--Providing they are not faulty and are burned in well. Completely interchangeable and mixable....
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Old 22nd May 2011, 07:36 PM   #43
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Here you can see original data for all 3 versions produced. The closest parameters has 6C33C-B (6S33S-V with latin letters). -B means made for military. This version has less tolerances (very little less), but also has shortest expected lifetime, only 750h. Remember - all of 6C33C are produced for military purposes (aircraft and missile electronics, power supply regulator tube, nuke proof), it really doesn't matter, what version you use in your audio amp. Just pick closest tubes for pairs.

It is allowed to use the 6C33C with one side heater turned on only. In this case you can get parameters close to 6C41C. If you may have interest to try this (I can't see why one should, but...)

Last edited by knoberik; 22nd May 2011 at 07:40 PM.
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Old 23rd May 2011, 08:58 AM   #44
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by knoberik View Post
It is allowed to use the 6C33C with one side heater turned on only. In this case you can get parameters close to 6C41C. If you may have interest to try this (I can't see why one should, but...)
Knoberik,

Are you saying that the 6C33c can be run with one or two heaters so we can reduce power for night listening?

I only just realized what you had said. LOL
That’s interesting.

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Old 23rd May 2011, 03:09 PM   #45
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Quote:
Originally Posted by M Gregg View Post
Are you saying that the 6C33c can be run with one or two heaters so we can reduce power for night listening?
Sure thing As you can see here on oem datasheet framed in red, I will translate:

Anode max current:
by using single cathode: 350 mA
by using double cathode: 600 mA
Anode max power dissipation:
by using single cathode: 45W
by using double cathode: 60W

So it's not a monday morning blue vision Just ask, if anything else on this datasheet seems interesting to translate.
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Old 23rd May 2011, 04:33 PM   #46
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Hmm....

Thats not a bad plan, but a little concerned about the cathode-idling-current, May be a little high for just one cathode--may also need to change/make switchable the cathode-resistor to compensate...

Dunno---

My 'breadboard' of this still usable (Although gone through more variations than a Ford Transit) so I'll play around with the 6C33 valves and one cathode only....
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Old 23rd May 2011, 04:37 PM   #47
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Hmm--Then again thinking about it, I didnt change the cathode-resistors when changing from the 6C33 to the 6C41C, so will Probably be OK....
I'll check and let you know what I find anyway...
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Old 23rd May 2011, 05:11 PM   #48
M Gregg is offline M Gregg  United Kingdom
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Alastair,

Could you also measure mains current with one and two heaters.
It would be interesting to know.


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Old 23rd May 2011, 05:39 PM   #49
M Gregg is offline M Gregg  United Kingdom
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Just a thought,

Turning one side OFF:

Any thoughts on reflected impedance?

Miller effect should reduce?


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Old 24th May 2011, 11:46 AM   #50
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Output impedance will increase....

'Reflected Imp'. normally refers to Transformer coupling...

Miller shouldnt be an issue, the drive signal is strong enough anyway...
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