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Old 4th March 2008, 03:18 PM   #11
ilimzn is offline ilimzn  Croatia
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Thanks guys, it was a pleasure. At least I get to give back some good info, for the good info many of the people here gave me! And... I did skip a few tubes, so I could have done a better job
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Old 4th March 2008, 10:04 PM   #12
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The 6AK5 makes a dandy little RF amp up through VHF.
I've got a schematic for one on my site:
http://www.users.qwest.net/~ptaylor/Radio/vhf1watt.gif
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Old 4th March 2008, 10:11 PM   #13
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That is for REALLY wide band audio stuff ........
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Old 5th March 2008, 12:51 AM   #14
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I don't use tubes for bias rectifiers since I want to be sure that the B- is available before the B+ is.

George,

I agree that a bias supply (C-) should be instant on. OTOH, the soft start is fine in the negative rail under a LTP (B-). FWIW, the "finals" in "El Cheapo" are cathode biased.
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Old 5th March 2008, 03:18 AM   #15
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Over the weekend, a friend gave me two boxes of tubes. If I may list some of them, are any good for an audio project or two?
Bulgin,

As previously indicated, the 7C5s are Locktal based members of the 6V6 family. It's very likely the tubes you possess were made by Sylvania, regardless of the label. I'm disinclined to suggest you use the 4 tubes in a PP circuit, as they rate to be poorly matched. However, you could build a singled ended amp around 2X 7C5s and have a spare set of O/P tubes. I didn't notice a suitable driver tube in the collection. Can you acquire a 5965?
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Old 5th March 2008, 03:33 AM   #16
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Quote:
I agree that a bias supply (C-) should be instant on. OTOH, the soft start is fine in the negative rail under a LTP (B-). FWIW, the "finals" in "El Cheapo" are cathode biased.
You are indeed correct. I looked at the schematic of the El Cheapo when you first posted it, and have forgotten the details since then. Many of my designs are fixed bias and often use a negative voltage source for other functions. Since B- and C- are often the same source, I have gotten used to calling the supply B-. I prefer to have the negative voltage arrive first since it often is used for bias. I might consider a tube rectifier for the negative voltage if it was not being used for bias.
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Old 5th March 2008, 12:56 PM   #17
ilimzn is offline ilimzn  Croatia
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One that I skipped:

6C4 also known as EC90 is a miniature socket single triode, practically a single section of the 12AU7 double triode, the difference being that you can get away with more heat from the plate because it's alone in the envelope.
Datasheet: http://www.mif.pg.gda.pl/homepages/f.../127/6/6C4.pdf
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Old 5th March 2008, 10:43 PM   #18
bulgin is offline bulgin  South Africa
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Hi Eli

Thanks for the pointer. Yes, I think I can. I have a friend nearby who is a tube collector and he's sure to have. I'll post to let ya know how I'm getting along.

Regards

bulgin
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