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Old 8th July 2012, 07:34 PM   #531
dady is offline dady  Argentina
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Quote:
Originally Posted by atmasphere View Post
Well its not discontinued

The price is $4200.
Thanks Atma, sorry for not answer before, I have wallet for transistors and cocacola.
Still is a dream for me. Get a Atma kit and build it. Thanks again for your kindly patience
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Old 8th July 2012, 07:37 PM   #532
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Quote:
Originally Posted by andrea_mori View Post
Hi,
about 6$ each, 235$ for 32 valves including shipping.
I bought them on eBay from an Ukrainian.

Andrea
Dear Mr Mori, is possible to say where you get the valves and if you receive them, how looks, did you try them?
The best and now is no good for summer time connect the OTL or only for cook.
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Old 8th July 2012, 10:04 PM   #533
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Quote:
Originally Posted by dady View Post
Dear Mr Mori, is possible to say where you get the valves and if you receive them, how looks, did you try them?
The best and now is no good for summer time connect the OTL or only for cook.
Hi,
I boutght vallves from eBay user delax777mechanics, he told me that stock more Svetlana "C" winged 6H13C NOS/NIB.
I have not still tried them, but they look fine, all in the original military box.
Since they are 50 or more years old, it's a good thing to pre-conditioning them (72 hours each, 4 per time).
I'll plan to do that in a pair of months.

Andrea
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Old 8th July 2012, 11:07 PM   #534
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It is certainly a good idea, to heat up the valves for a few days before using them.
I have made a kind of testbench to pre-conditioning them.
I can head 14 tubes at once.
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Old 8th July 2012, 11:16 PM   #535
BUIZERD is offline BUIZERD  Netherlands
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Ok here's a piture of the rigg
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Old 9th July 2012, 08:39 AM   #536
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Thanks Andrea. Thanks for your data and replies.
I didn't know that measure. Precondition them? What is meaning?
Please could anybody explain the how and why? The valves have they own bed and they own stand room with voltage in the heaters. Mr Buizerd, Is possible is this device your cooking machine
Men! You looks professionals.
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Old 9th July 2012, 08:08 PM   #537
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For Dady,
Everything you want to know about pre conditioning the tubes can be found in this thread.

Regarding the testbench, it is actually one phase of the amplifier.
But with fixed HT and a controllable bias.
For each cathode resistor is a measuring sockets installed, ​​to measure each tube half for current.
In this way you can also pair the tubes.
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Old 9th July 2012, 09:08 PM   #538
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Thanks Buizerd. I got an idea.
If a group in this blog start to take measure from pools of valves. Register the data of current with Bias voltage. We can publicize the results and interchange the valves we have for better matched.
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Old 10th July 2012, 07:58 AM   #539
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Anybody get 32 the other one 40...etc. Me 40. I start to measure under the same conditions we fix by convention and make a common pool. We can see the more similar and make a smooth matching.
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Old 10th July 2012, 08:06 AM   #540
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You Mr Buizerd have the mother bench and can establish the standard parameters.
Respect to pre-conditioning what is this and which is the object to do.

Does Improve the emission? Does de poison the cathode? Does Is necessary DC or AC ? What amount of Its? Does Prolonged the live?

Best Regards for all and good sumer time. Here on Menorca the season come with the best. My family is enjoying every day.
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