Information/data sheet on the 33JV6 Compactron?

[powerking]

This may not be the correct forum, but thought I'd ask anyway.

It seems that RCA introduced this 12 pin Compactron in ~~ 1961; power pentode. Did any TV's of the era use this? The David Berning amp that used this tube is quite bizzare. Was this some kind of more "modern" variant of the 6L6, 5881, KT-66 or such? I see little to no info on the "net.

BTW, they are cheap and a dime-o-dozen on eBay; so not too much demand out there, IMHO.

http://davidberning.com/Files/review...862_eprint.pdf

Tom (PK)

[zeno]

Dont remember them but it has a ring to it. Looked up 6JV6
but its a 9 pinner. Being a 33 volt it may have been used
in a series string low end HiFi. I dont see why a TV or anything
else would use what must have been hefty tube power wise.
How is it used ? As an output in push pull ? Home brewers often
use odd ball tubes that nobody wants to save $$$$.
Very interesting........

73 Zeno

[powerking]

Since there are 4 of these in the picture of the amp rated @ 30W/channel; one has to assume it's still a class A/B configuration.

In reading the above reference to Berning's amp this part sounds like the tube was a "white elephant" of sorts:

"Note that the 33JV6 may not be
replaced with a different type. Prior to replacing tubes, be sure
to explicitly follow all of the safety precautions outlined in the
owner’s manual, as high DC (900V) and high AC voltages (1600V)
are present inside the chassis. Since the idle-plate dissipation of
the power tubes is only 7.5W and their heaters are operated below
the rated voltage, their expected lifetime, according to Berning, is
10,000 hours."

Tom (PK)

[zeno]

Sounds like they are odd ball horz output tubes by the
specs stated. Prob only used in a few chassii for a short time.
In the good old days we used to order 2 of almost anything so
odd ball parts stack up including tubes. Explains why so many
around. The price would sure beat 4 quality 6CA7's etc if
you can make it right ! I bet most old horz outs have been tried
as finals or P-P amps no matter how odd they are.

73 Zeno

[Electronic M]

Interesting amp. I've heard of OTL amps before (heck I've even built one), but ZOTL is an alien concept to me.
He says he is using some kind of RF system to match tube impedance to the speakers.
I wonder if the tubes are being fed (AM?) modulated RF which is then stepped down at a single RF frequency and high level demodulated at the speaker output terminals?

I would love to see a schematic or block diagram of what is inside that amp.

[Rod Beauvex]

http://www.radiomuseum.org/tubes/tube_33jv6.html There's a pinout and that's it.

I went through Frank's Tube Datasheet website, the Tube Datasheet Locator, and The GE tube book. No 5, 6, 8, 12, 33, or 50JV6.

No one seem to want to fess up to this turkey. :p

[powerking]

Quote:

" I went through Frank's Tube Datasheet website, the Tube Datasheet Locator, and The GE tube book. No 5, 6, 8, 12, 33, or 50JV6.

No one seems to want to fess up to this turkey. :p"


My point exactly for this post (been there--done that already)......


Tom (PK)

[Rod Beauvex]

Well, it never hurts to have two sets of eyes, and I had no way of knowing beforehand what you have and have not done.

[wa2ise]

it's in the RC27 RCA tube manual.

12 pin compactron also comes in a 21v heater @0.45A version.

33v @ 0.3A heater
130v plate voltage:
screen volts 130v
plate resistance 11K
transconductance 9100 umhos
plate current 50ma
G1 volts -20v
G3 tied to cathode
G1 grid resistance max 1 meg

triode connection mu 4.7
plate dissipation max 18w

[Rod Beauvex]

I'm genuinely curious as to why a Compactron would be in an RCA manual and not the GE?

[Olorin67]

Its possible that tube was introduced by another company, and GE left it out of thier manual because it competed with thier own offerings, or maybe it was a later type that just isnt in the older manuals. GE introduced the 12 pin Compactrons, but the other tube makers made them too, and even introduced new types once they became popular with tv makers. For some types of tubes, the extra pins were needed, which the competing other formats such as Novar and Magnoval tubes lacked.
Most tube companies wanted to be able to sell a full line of tubes, so they would rebrand tubes from other manufacturers to supply types they did not manufacture themselves, especially for low volume replacement sales.

[marty59]

Originally Posted by wa2ise

it's in the RC27 RCA tube manual.

12 pin compactron also comes in a 21v heater @0.45A version.

33v @ 0.3A heater
130v plate voltage:
screen volts 130v
plate resistance 11K
transconductance 9100 umhos
plate current 50ma
G1 volts -20v
G3 tied to cathode
G1 grid resistance max 1 meg

triode connection mu 4.7
plate dissipation max 18w

And a reference to a 21JV6 too.