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Old 9th August 2011, 02:08 PM   #1
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Default GM 70 Schematic needed!

i have two pairs of 6c33c monoblock on the way, but i will have an extra pair of boxes.... They are 45x27cm each so they are big enought to fit some GM70 SET.

Can someone recomand me a schematic? I will also need some building details for the OPT's as they will be custom wounded.

Thanks in advance!
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Old 9th August 2011, 06:13 PM   #2
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How about this?
How to Make a Transmitter Class Amp

The driver is triode strapped, FYI.
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Old 10th August 2011, 07:05 AM   #3
vuki is offline vuki  Croatia
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drZ Lab GM70SE
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Old 10th August 2011, 02:10 PM   #4
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Nice! both of them . I have material for a few day now
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Old 10th August 2011, 04:48 PM   #5
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2 stages SE GM70 & 6E5P /6P15P/:
https://picasaweb.google.com/1095707...52118138780210
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Old 11th November 2012, 08:13 AM   #6
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Quote:
Originally Posted by vuki View Post
Hello
I plant to build these amplifier.
Do you think I can use a 400mA 400-0-400V transformer?
I see in the schematic he use 500mA transformer.
I want to order my power transformer from Antec the best to feed these amp 2x360V or 2x400V both 400mA.
I think the 400V would be better if the power rating enough for a Stereo.
Please advise.
Thank you Gabor
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Old 11th November 2012, 07:03 PM   #7
vuki is offline vuki  Croatia
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Quote:
Originally Posted by gaborbela View Post
Hello
I plant to build these amplifier.
Do you think I can use a 400mA 400-0-400V transformer?
I see in the schematic he use 500mA transformer.
I want to order my power transformer from Antec the best to feed these amp 2x360V or 2x400V both 400mA.
I think the 400V would be better if the power rating enough for a Stereo.
Please advise.
Thank you Gabor

You can use 400mA transformer, but with 400V you'll be close to 1000V dc. If your capacitors can stand it - why not, but you'll have to adjust R6 in power supply to get driver anode voltage right.
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Old 11th November 2012, 07:18 PM   #8
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Hello
Thank you!
Yes I will adjust the needed resistors, I just wanted to know if the transformer can supply enough power for the two channel because 400mA not 500mA.
I have all the parts for the amp, just need the transformers. I do wanted to order a pair FIAT OPT but shipping to Canada 160Euros..
Also I want to purchase the power transformer but Antec has only these 400mA rating.
To order from Plitron a specially designed transformer it would cost $200-300..
Thanks one more time

Greetings Gabor
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Old 11th November 2012, 07:30 PM   #9
vuki is offline vuki  Croatia
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Hi Gabor,
a friend made a version with Trafomatic output transformers which are excellent. So, you can ask their USA dealer for a price quote - maybe it won't be so expensive as FIAT. Electraprint transformers seem to be moderately priced and with good specs also.
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Old 11th November 2012, 08:27 PM   #10
djn is online now djn  United States
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Here is what I am building.

Not on the schematic is the Rod Colman Heater boards for the GM70 filament heaters.
Attached Images
File Type: png Final final 5-8-2012.PNG (75.1 KB, 331 views)
File Type: png Kegger final version.PNG (259.1 KB, 343 views)
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