Anyone used C3g to drive GM70? - Page 2 - diyAudio
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Old 22nd July 2011, 05:26 PM   #11
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Hello
I just purchased some D3a tubes in case the 3 stage I planed to build I do not like..
I purchased because a year a go it was $7/PC on Ebey now some people ask even $35 to.
I read the D3a drive very well the GM70 in both mode with interstage transformer or coupling caps.
Let us know your result! Thank you. In case you have a good schematic I would be interested..
Greetings Gabor
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Old 23rd July 2011, 01:30 AM   #12
Ryssen is offline Ryssen  Sweden
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Quote:
Thank you. In case you have a good schematic I would be interested..
No schema,other than I plan to use ledbias and a CCS on the D3a.
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Old 23rd July 2011, 01:47 AM   #13
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Hello Ryssen

Anything would help! But not urgent at all, when you done yours. Are you planing to use inter stage Xformer?
Specially at the amplifier stage. PS schema I have several..
How I wrote I just purchased 6PC D3a tubes these week, today I purchased 3PC 12GN7A Sylvania tubes.
Just to have these tubes until still available and not to pricy.
What type of OTP you use??

Greetings gabor
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Old 23rd July 2011, 09:13 AM   #14
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Quote:
And I will try capacistors first,maybe later when I can afford it, IT trafo
Hey,
Why not go for the CCS/CVVS PCBs we are eagerly waiting for. You could then try both Low-, and Hi-Z(D3a 2k) and CVVS drive.
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Old 23rd July 2011, 12:48 PM   #15
djn is offline djn  United States
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I am planning on driving my GM70 with the 12HL7. I also have Rod's boards for the GM70 fillie heaters.
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Old 23rd July 2011, 01:23 PM   #16
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Hello

Can someone post a picture from the PC board..
You know the best solution is the P to P soldering. But if the board help certainly I can buy a pair.
I have to see what goes to the board.
djn thanks for your website, I will check it out
Thank to all of you
Look like these GM70 tube getting more & more popular among the DIY-ers..

Greetings Gabor
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Old 23rd July 2011, 02:13 PM   #17
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Quote:
Can someone post a picture from the PC board..
Why not go to Rods thread about it. If it isnīt there, itīs probably because Rod doesnīt want to show the layout. Or ask Rod!

Have the boards for 813. The layout is, if I remember it right, shown in the manual.

So buy a pair, they are extremely cheap!
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Old 23rd July 2011, 04:32 PM   #18
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Hello

I do not write to see the PC board to make a copy. I want to know what is going on , for what tube was design etc.
I think a sketch would be better in these case..
Who is Rod, where I found his site?
I understand it is extremely cheap , my question can I use it.
I already purchased some parts in wain, what I would like to avoid in the future. I live on disability support in one word on very little money.

Greetings gabor
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Old 24th July 2011, 02:58 AM   #19
Ryssen is offline Ryssen  Sweden
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Quote:
Hey,
Why not go for the CCS/CVVS PCBs we are eagerly waiting for. You could then try both Low-, and Hi-Z(D3a 2k) and CVVS drive.
If I know how to use it,yes I can try it.
Do I adjust the CCS as a regular CCS?

Click the image to open in full size.

But how do I adjust P101/P102?
Is this suposted to be lika a SRPP?
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Old 24th July 2011, 10:50 AM   #20
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Quote:
Do I adjust the CCS as a regular CCS?
Do you mean:

"Do I adjust the VCCS as a regular CCS?"

In that case, no.
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