Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Trevor_Long on September 13, 2010, 10:35:10 am

Title: ID this tube!
Post by: Trevor_Long on September 13, 2010, 10:35:10 am

Hey Guy's,

I'm assuming this is an electron tube of some sort... can anyone here identify?  There are no visible markings.

Thanks!

(http://fonzarelli.smugmug.com/Music/Amps/IMG00013-20100913-0759/1006143437_QoxJp-L.jpg)

(http://fonzarelli.smugmug.com/Music/Amps/IMG00014-20100913-0800/1006143250_Nwjmj-L.jpg)

Title: Re: ID this tube!
Post by: PRR on September 13, 2010, 03:31:48 pm

833A

A.K.A. CV0635 833 833A GL833A C833 TY4-350 WL833A T833A ES833 B142  

350 Watts plate, 100 Watts filament. Pair with 3,000V-4,000V will get you 1,600-2,600 Watts audio.

http://www.mif.pg.gda.pl/homepages/frank/sheets/049/8/833A.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/111/8/833A.pdf
http://www.r-type.org/exhib/aag0032.htm

Worth a couple hundred bucks in as-new condition:
http://www.tubedepot.com/nos-833a.html


You just got the one?

If you could source a 500V 700mA supply and a 700-1K 700mA SE OT, and a 6550 grid buffer, you might be able to build a 130 Watt hellufa-Champ amp slightly heavier than an SVT.

Else: get an old large PC power supply. Jumper the ATX pins to turn it on. Put 8 ohms 20 Watts (Radio Shed part) on the +5V to load it. Find 0.2 ohm 50 Watts of resistance to put in series between the 12V out and the 10V 10A filament. Night-light!

Title: Re: ID this tube!
Post by: Trevor_Long on September 13, 2010, 05:45:20 pm

Thanks PRR!  I had a hunch you would come through with this one!

So, I suppose this was utilized in a radio station or something of that nature?

Title: Re: ID this tube!
Post by: PRR on September 13, 2010, 08:26:12 pm

http://www.tubezone.net/pdf/diagrams/gatesbc1-cl.pdf
(4MB PDF)
Pages 4, 5, and 7.

Title: Re: ID this tube!
Post by: toomanyslurpees on September 14, 2010, 12:54:51 am

My vote's for the hellufa-Champ!

Title: Re: ID this tube!
Post by: billcreller on September 14, 2010, 01:43:18 am

  I seem to remember my brother mentioning that particular tube.  He's a ham-radio nut.  I figured it to be a transmitter tube, with the heavy duty posts etc.

Title: Re: ID this tube!
Post by: supro66 on September 14, 2010, 05:46:52 am

Quote from: billcreller on September 14, 2010, 01:43:18 am

 I seem to remember my brother mentioning that particular tube.  He's a ham-radio nut.  I figured it to be a transmitter tube, with the heavy duty posts etc.

My Yaesu 401-B has two 6KD6 tubes

I thought these were big  :huh:

 6KD6 finals (2), 33w plate dissipation =
66w total. With 560 W PEP input, 50%
efficency, over 200 watts in heat... big
fan to keep these tubes cool.

http://www.ne.jp/asahi/myamada/tube/TUBE_LIB/6KD6_6JS6_6CB5/6JS6_6KD6.JPG

Title: Re: ID this tube!
Post by: bmack on September 14, 2010, 02:02:34 pm

&feature=related

Just saw this the other day.  Even though it's recorded with a crappy camcorder mic, you can tell it would sounds real nice in the room.

Title: Re: ID this tube!
Post by: kagliostro on September 15, 2010, 01:47:48 am

Quote

Else: get an old large PC power supply. Jumper the ATX pins to turn it on. Put 8 ohms 20 Watts (Radio Shed part) on the +5V to load it. Find 0.2 ohm 50 Watts of resistance to put in series between the 12V out and the 10V 10A filament. Night-light!

I've seen the movie

&feature=related

Quote

Night-light!

now I understand

a very nice one  :smiley:  :smiley:  :smiley:

Kagliostro

Title: Re: ID this tube!
Post by: DummyLoad on September 16, 2010, 09:41:14 am

thought about building an amp with one of these (http://tubedata.milbert.com/sheets/049/8/829B.pdf)

use almost common as dirt 6600Ω 50W iron w/ 8Ω load on 4Ω tap. a very manageable 36Vpp to drive to 44W. use separate PS for G2.

hammond 279X w/ SS FW gets you to +600V and change. 379X adds a 50VAC bias tap. hammond 1650H or 1650P for OT.

a friend offered me a pair - i just didn't want to part with the $$$.