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Old 19th April 2005, 04:06 PM   #1
day is offline day  Thailand
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Default want to do PP-GM70

hello... form THAILAND
I like to do PP-GM70 . I have tube OPT CASE POWER but circuit.
Help me please. where can i fine it.
thank you
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Old 19th April 2005, 05:43 PM   #2
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Indeed, very little to find about it.
Read a couple of times that the gm70 is a beefed up 211
So...maybe you can try 211 or 845 schematics and play with the resistor values a bit
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Old 20th April 2005, 12:38 AM   #3
jlsem is offline jlsem  United States
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Try this newsgroup:

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

John
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Old 21st April 2005, 10:45 AM   #4
day is offline day  Thailand
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Thank you
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Old 21st April 2005, 02:33 PM   #5
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With the exception of it's unique socket and 20 v filament, the GM70 can be used interchangeably with the 845.
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Old 27th April 2005, 05:28 PM   #6
day is offline day  Thailand
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this is my finish PP GM70. I use 5751 for pre and phase st 5687 for drive sound is very good
DAY
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Old 27th April 2005, 08:26 PM   #7
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Very nice! And very quick assembly!

What design did you use? That bloody forum won't validate my membership for some reason
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Old 28th April 2005, 12:53 AM   #8
jlsem is offline jlsem  United States
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Quote:
this is my finish PP GM70
That's gotta be a record...

John
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Old 28th April 2005, 11:38 AM   #9
day is offline day  Thailand
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i plan it by use OTL design in drive st and copy 845 in out put
fix bias at -100v at b+ 960v
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Old 2nd June 2005, 03:33 PM   #10
day is offline day  Thailand
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This is my 2TH PPgm70. it is 5687+300B+interstage+GM70
still working
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