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Home made gm70 amplifier

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Tubedac123

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Home made gm70 amplifier
« on: 24 Nov 2025, 07:42 pm »
Hello want to post my ampqq

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FullRangeMan

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Re: Home made gm70 amplifier
« Reply #1 on: 24 Nov 2025, 09:25 pm »
Fantastique...  :thumb:
Wow Superb amp, Iam plenty of GM70 tubes from 1960 and 1970.
Who made this gem ?
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Phil A

Re: Home made gm70 amplifier
« Reply #2 on: 25 Nov 2025, 01:10 am »
Welcome!
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ArthurDent

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Re: Home made gm70 amplifier
« Reply #3 on: 25 Nov 2025, 02:08 am »
Greetings & Welcome to AC   :thumb:  Looks very nice.
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Tubedac123

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Re: Home made gm70 amplifier
« Reply #4 on: Yesterday at 04:58 pm »
This gm 70 was made by me
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Tubedac123

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Re: Home made gm70 amplifier
« Reply #5 on: Yesterday at 05:05 pm »






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FullRangeMan

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Re: Home made gm70 amplifier
« Reply #6 on: Yesterday at 06:42 pm »
Quote from: Tubedac123 on Yesterday at 04:58 pm
This gm 70 was made by me
Nice congratulations.
What are the input tubes  ?
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Tubedac123

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Re: Home made gm70 amplifier
« Reply #7 on: Today at 04:21 pm »
The input tubes are 6n1p tubes Duelund bypass capacitor mundorf capacitor Kiwami resistors j&k audio output transformer j&k power transformer j&k choke mill specs wire the chassis was made from aluminum from eBay the amp meter was from my Mr liang 845 tube amplifier the pre amp stage is a Lukasz Fikus schematic
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FullRangeMan

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Re: Home made gm70 amplifier
« Reply #8 on: Today at 06:22 pm »
Quote from: Tubedac123 on Today at 04:21 pm
The input tubes are 6n1p tubes Duelund bypass capacitor mundorf capacitor Kiwami resistors j&k audio output transformer j&k power transformer j&k choke mill specs wire the chassis was made from aluminum from eBay the amp meter was from my Mr liang 845 tube amplifier the pre amp stage is a Lukasz Fikus schematic
These input tubes on post 1 are not 6N1P which dont have this bakelite base as these, they seems to be 6H8C/6H9C or other tube with bakelite base.
« Last Edit: Today at 09:21 pm by FullRangeMan »
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