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Old 18th February 2005, 08:39 PM   #1
gianis is offline gianis  Greece
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Default 6336a

I have 2 tubes 6336 , i want to built something with these tubes, SE OR P-P, please any information about this??? thanks.
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Old 18th February 2005, 10:43 PM   #2
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The 6336 is a dual voltage regulator triode, 30W Pa per section, so 60W overall. High gm, low m and low ra. The low m of around 2 point something makes it a little bit hard to drive, though, as does its input capacitance. You can see the data for the 6336A on Frank's here, though I'm not quite sure what the difference between the 6336 and 6336A is (probably heater warmup or something, not sure...)
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Old 18th February 2005, 11:53 PM   #3
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Hi,

Quote:
though I'm not quite sure what the difference between the 6336 and 6336A is (probably heater warmup or something, not sure...)
Plate material mostly.

What can you do with just a pair of 6336's anyway?

They're not easy to put to use.
Usually far from matched between triode sections and draw enough current for their heaters alone to make the electricity board stinking rich....

Cheers,
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Old 19th February 2005, 06:20 AM   #4
SY is offline SY  United States
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And let's not mention that joke of a mu. They're fine series regulator tubes, though.
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Old 19th February 2005, 06:50 AM   #5
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The way this thread seems to be heading, someone soon will ask to be sent these for 'proper disposal'.

As Frank said, section to section variation can be quite large with these types, so PP operation might be a bit iffy and require careful balancing to prevent DC in the OPT core, but nonetheless someone has made a 6336 PP amp (using a toroidal OPT, no less). But of course, you only have two, so you are left with no spares.

OTL is also out of the question since this needs far more valves than you have on hand.

Hmm... I suppose you could try using a single 6336 as a stereo SE amp, for about 6W per channel. Something along the lines of the "Scrapbox Challenge" if you have the book Valve Amplifiers. You might need a more substantial driver stage than offered for the "Scrapbox Challenge" (SE 6528) since the 6528 has a much higher m (around 9 or so)
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Old 19th February 2005, 08:26 PM   #6
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Default 6336-SE

Hello,

I’m about to fire up the 6336-SE design of Grover Gardner.
Do a google-search and find it. He called – after comparing - this design a ‘Baby-845’, which indicated enough about the nice qualities of this tube.
Indeed it needs a good drive. And beware that the inrush current of the heater is over twice the nominal 5A/6,3V. So a delay that shorts a resistor of say 0,50 ohm/25W after some seconds can spare fuses.

Need a while to report my sonic impression. I visit this forum not frequently.

Arjen.
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Old 19th February 2005, 09:01 PM   #7
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Nice tube - very low plate Z!

Useful for OTL

Been done up using the Russian equivalent 6C33C (iirc) which has even lower plate Z and more current capability as PP, SE (Borbely Audio has some iron & a design for it) and as mentioned, OTL.

Cool tube.

Run it in A2 or AB2, imho.

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Old 20th February 2005, 01:32 AM   #8
jlsem is offline jlsem  United States
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Quote:
And let's not mention that joke of a mu.
Yes, but your output transformer needs a primary impedence of only 1000 ohms. A super-sized "Lilliput" comes to mind.

John

Oh dear, an oxymoron.
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Old 20th February 2005, 02:04 PM   #9
gianis is offline gianis  Greece
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Thanks a lot , for the responses, and informations.
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Old 25th July 2005, 07:05 AM   #10
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Quote:
Been done up using the Russian equivalent 6C33C (iirc)
Hi,
Um... why is that?
I can't see this from the characteristics...
Could you explain further?
Lhchen
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