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Old 10th July 2007, 02:54 PM   #1
Fuling is offline Fuling  Sweden
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Default Help me find some odd looking rectifiers!

Hi,

Im collecting parts for an "just for the looks"-amp with RCA 808 power tubes and DET20 (2C22) inputs.
Both of the tubes mentioned above has two topcaps each, so what Im looking for is a rectifier tube that will mix well visually with these, ie 40s style with one or preferably two topcaps.
Single diodes would be just as good as duals.

Each channel will consume 120-150mA @ 350-400VB+

Pictures of 2C22 and 808 to get an idea of what Im looking for:

http://www.wiwitubes.com/pic/tube/RCA808.jpg

http://www.r-type.org/exhib/aai0283.htm
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Old 10th July 2007, 03:36 PM   #2
Gluca is offline Gluca  Italy
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I'd say EIMAC RX21 ... but they are hard to find. Or ... well ... globe 866As look gorgeous.

Ciao
Gianluca
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Old 10th July 2007, 03:47 PM   #3
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I second the globe 866's. Simple looking but very pleasing.
Where did you find 808s ???????
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Old 10th July 2007, 06:26 PM   #4
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RCA has some mercury rectifiers smaller than the 866, the 816 I think. How about a bridge using selenium stacks? The larger ones are rather impressive with all the finned plates.
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Old 10th July 2007, 07:48 PM   #5
Fuling is offline Fuling  Sweden
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Hi,

That Eimac rectifier looks good and so does 866 and 816 but
(I should have mentioned this in the first post) Ill avoid mercury and gas filled rectifiers as they have to warm up before any HT can be applied. There are of course ways to deal with that, but Id like to keep things as simple as possible.

I have four 808s (2 JAN), all untested. Ill have to test them to see if I got at least one functional pair before I invest any more money into this project.
Got the first 808 almost for free, the others has been hunted down over a period of about two years.
Quite rare and expensive tubes, especially in this corner of the world and there seem to be no subs.
Ill build the amp so that they can be replaced with 811As with minor modifications.

BTW: Selenium rectifiers...well, worth a look! But arent they a mess to work with? (Toxic)
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Old 10th July 2007, 08:40 PM   #6
liberty is offline liberty  Italy
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What do you think about this?

http://www.tektron-italia.com/images/RGN1404-TFK.jpg
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Old 10th July 2007, 08:45 PM   #7
Colt45 is offline Colt45  Serbia
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bah, don't bother with selenium
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Old 10th July 2007, 08:55 PM   #8
Gluca is offline Gluca  Italy
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Quote:
(I should have mentioned this in the first post) Ill avoid mercury and gas filled rectifiers as they have to warm up before any HT can be applie
You just need a switch to turn the B+ 20 secs after the fils (when tubes are lit up often), pretty easy and they sound better.

Ciao
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Old 10th July 2007, 08:56 PM   #9
Fuling is offline Fuling  Sweden
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Quote:
http://www.tektron-italia.com/images/RGN1404-TFK.jpg
Sweet looking rectifier for sure, but too old (and probably made of Unobtanium and very expensive)

Quote:
bah, don't bother with selenium
Thats what my gut feeling tells me, too. Replacing broken selenium rectifiers with silicon diodes seems to be one of the more common repairments in old tube stuff.

Well, if I dont find any good looking, cheap and easily obtainable tube rectifiers Ill just use some damper- or sand diodes.
A cool looking tube rectifier would be nice but not necessary.
There will be some sand (mosfets) involved in the driver stage anyway, since the 808 needs positive bias and quite a bit of grid current to work in SE circuits.
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Old 10th July 2007, 09:06 PM   #10
liberty is offline liberty  Italy
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Quote:
Originally posted by Fuling

Sweet looking rectifier for sure, but too old (and probably made of Unobtanium and very expensive)

Yes, expensive. 70 Euro each.


http://www.tektron-italia.com/tubes/radios.shtml


maybe you can find something cheeper here:

http://www.benedettimauro.com/oldradio/valvolerare.asp
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