852 tube

lochness · 23rd October 2007, 01:58 AM

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).

astouffer · 23rd October 2007, 02:17 AM

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

HollowState · 23rd October 2007, 02:35 AM

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)

lochness · 23rd October 2007, 02:38 AM

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.

astouffer · 23rd October 2007, 03:03 AM

Hey that picture jogged my memory. I have one those tubes!

HollowState · 23rd October 2007, 03:45 AM

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

lochness · 23rd October 2007, 04:15 AM

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.

Miles Prower · 23rd October 2007, 06:16 AM

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.

Colt45 · 23rd October 2007, 06:32 AM

GM100 maybe. they're ridiculously big though.

astouffer · 28th October 2007, 09:03 PM

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

23rd October 2007, 01:58 AM	#1
lochness diyAudio Member Join Date: Dec 2006	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).

23rd October 2007, 03:45 AM	#6
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	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 __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FS tube tuner, Active filter kit, tube amp, amp3	Josephjcole	Swap Meet	9	20th July 2007 04:05 PM
SS or tube voltage amplifying stages in an amp with tube output?	ray_moth	Tubes / Valves	14	4th July 2007 03:09 AM
need diy tube preamp (line-stage) recommendation and general tube advice	Musiclover4	Tubes / Valves	15	24th November 2005 01:19 AM
tube driving the same tube - whats the collective word?	zobsky	Tubes / Valves	3	13th June 2005 06:47 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

23rd October 2007, 02:17 AM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	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

23rd October 2007, 02:38 AM	#4
lochness diyAudio Member Join Date: Dec 2006	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.

23rd October 2007, 03:03 AM	#5
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Hey that picture jogged my memory. I have one those tubes!

23rd October 2007, 04:15 AM	#7
lochness diyAudio Member Join Date: Dec 2006	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.

23rd October 2007, 06:32 AM	#9
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	GM100 maybe. they're ridiculously big though.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)