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Old 23rd October 2007, 01:58 AM   #1
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Default 852 tube

hey I was wondering if anyone knew anything about this tube? I've been searching all of the internets for information on it but haven't found anything other than RCA was one of the manufactures of them. I want to find it specs so I can decide if i want to go searching for this tube (can't seem to find a site to buy it on that actually has it in stock).
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Old 23rd October 2007, 02:17 AM   #2
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filament is 10 volts at 3.25 amps
plate dissipation=100w
max plate current=150mA
max grid current=50mA
amplification factor=12

From an old Radio Amateurs Handbook. No plate curves, just those specs and class B and C ratings. A pair with 3kv on the plates will give 320 watts into 10k ohms
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Old 23rd October 2007, 02:35 AM   #3
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Hokay, From a 1941 issue of "RCA Guide For Transmitting Tubes" I found this. The filament is 10V @ 3.25A similar to it's tetrode cousin the 860. (I love that price)
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File Type: jpg 852.jpg (94.4 KB, 236 views)
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Old 23rd October 2007, 02:38 AM   #4
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Don't think I'd be putting that much power into em but...wow...still searching for some curves but this is definitly a start. Anyone know where I could get them? Still trying to track a source down.
If that doesn't work then I'm going to make a big change of plans and go with the 860 (tetrode) as I can find curves and a source for it.
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Old 23rd October 2007, 03:03 AM   #5
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Hey that picture jogged my memory. I have one those tubes!
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Old 23rd October 2007, 03:45 AM   #6
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astouffer,
It's possible that you may have one, but more probable that you have an 860 since they were much more popular and they look the same except for an extra grid. I have several 860s.

lochness,
If you find any 852s or 860s, don't pay much. Because of their age they're almost sure to be gas bottles. Even if they're unused and look perfect. If it's only slightly gassy you may be able to pull it down by running it at low power for a time. But most times it's a total loss because it will suddenly ionize bright blue as plate voltage is brought up. I have a lot of experience with these old tubes.

Victor
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Old 23rd October 2007, 04:15 AM   #7
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HollowState

that sucks. I was mainly going with them (852, 860, 861) as they were among the oddest looking tubes I had ever seen. I still might pick a few up just to collect them for the nicknack shelf.

So does anyone know of any high power tubes that are particuarlly odd looking (or have any sort of personality to em') that I wouldn't have a gassy proplem with?
Its going to be for a big inefficient subwoofer's amp.
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Old 23rd October 2007, 06:16 AM   #8
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Quote:
Originally posted by lochness
HollowState

that sucks. I was mainly going with them (852, 860, 861) as they were among the oddest looking tubes I had ever seen. I still might pick a few up just to collect them for the nicknack shelf.

So does anyone know of any high power tubes that are particuarlly odd looking (or have any sort of personality to em') that I wouldn't have a gassy proplem with?
Its going to be for a big inefficient subwoofer's amp.
Looks like a down rated 806. (Yeah I'd like to get a few of those, and they are just as odd) I wouldn't expect that these would be all that easy to find. Look at that u-factor: 12. RF practice tended to favour power triodes with higher u-factors for improved sensitivity. There are lots of these types available, and are frequently used to build Class A2 SETs, or used as zero bias, Class AB2 amps.
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Old 23rd October 2007, 06:32 AM   #9
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GM100 maybe. they're ridiculously big though.
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Old 28th October 2007, 09:03 PM   #10
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Default 852 pics

Its used but still has a good vacuum. Picked it up (along with many others) from the estate sale of a silent key.
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