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-   -   GM70 Triode (http://www.diyaudio.com/forums/swap-meet/18252-gm70-triode.html)

WALTER BURKHARD 27th July 2003 05:46 AM

GM70 Triode
 
2 Attachment(s)
GM70 Triode tubes Sale

have decided to make a bit of a clean out in my stock of 8 Pieces GM70 tubes. Old Military stuff. All Tubes are used but ok.
One Pieces 33.Minimum Order 2 pieces + shipping
Walter

NickC 28th July 2003 02:24 AM

do you have the sockets for these? looks hard to get i remember the pins are not in a square configuration i think it is trapiozedal.
Do you have the data sheet for this. Want to find out max power dissipation, rp, mu most sheets are in russian. More important is the max dissipation.
THanks

Brett 28th July 2003 02:59 AM

Quote:

Originally posted by NickC
do you have the sockets for these? looks hard to get i remember the pins are not in a square configuration i think it is trapiozedal.
Do you have the data sheet for this. Want to find out max power dissipation, rp, mu most sheets are in russian. More important is the max dissipation.
THanks

Send me PM and I'll email you good datasheet in English.
Pd = 125W

Sockets are a PITA to get, so I used a cap clamp under chassis to hold them, and brass crimp on connectors pushed onto yhe pins. There is little to no opportunity to tube roll, so it was a satisfactory solution.
You'll also need good DC for the filament.

There's a Yahoo group that started with a bit of an emphasis on this tube but has broadened it's horizons

http://groups.yahoo.com/group/GM70/

NickC 28th July 2003 06:50 AM

brett
i can't email your email as your add is not listed in the forum and you disable emails in your particulars section
could you email instead at nickcrap@hotmail.com. That address is spam always no point hidding my account.
THanks alot brett.
Great idea about mounting the tube, plus if you get metal clamp could use as a heat transfer to heatsinks cooling the base. Real orginal

Brett 28th July 2003 07:24 AM

Oops, I thought I'd enabled the email again.

Anyhoo, I've sent off a pdf with data and curves as well as another set of curves.

The cap clamp type base was something I came up with out of neccessity, as the surplus sockets you see on ebay are crap or you have to drill and modify the 6C33 ones, which is also less then optimum.

Just to give you an idea, I made mine with a 600V B+, PP, cathode biassed, 120mA/tube, 6ka-a for about 12Wrms or double that peak. Lots of people use them as SETs both series and parallel fed with good results. Another common op point is 800-850V, 135mA but I didn't find they sounded a lot different wherever I tried them.

NickC 28th July 2003 09:53 AM

Walter i can't personaly message you regarding the tube. I am very keen on purchasing the tubes. I thinking of going with 4 tubes. I would like to know regading the mail cost of sending it over to Malaysia. Also how can i go about paying you? TT,western union bank draft, money in mail. my mail address is at nickcrap@hotmail.com. Email me back regarding the details thanks

WALTER BURKHARD 31st July 2003 05:26 PM

GM70
 
Hallo Brett,
my email walter_burkhardt@web.de
i using by myself septar sockets for the GM70 tubes.

regards walterwalter_burkhardt@web.de

WALTER BURKHARD 31st July 2003 08:29 PM

sockets
 
2 Attachment(s)
GM70 SOCKET

WALTER BURKHARD 31st July 2003 08:31 PM

GM70 SEPTAR
 
2 Attachment(s)
GM70 SEPTAR

audioman71 16th January 2004 01:31 PM

Hi there !
-I have a lots of GM70 tubes and I want to DIY the Ampli with GM70 , but I dont have schematic for GM70 and sockets if you need them contac me : haidvd@pmail.vnn.vn
-Any one help me !


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