GM70 SET direct coupled 2x30W monoblock amplifier

noyan · 30th January 2009, 08:14 PM

I am selling my new custom built GM70 2x30W monoblock set amplifier. Amplifiers as shown in attached actual photographs. It was new built point-to point connections and tested by me. The schematic and user manual document will be supplied with amplifier. Amplifier has very loud and open sound, with lovely midrange and deep bass. Giving huge sound even without clipping.

Explanation of design:

- Both halves of 6N8S tube are direct coupled to each other. The output of 6N8S tube also direct coupled to GM70 tube by using an anode choke to eliminate the sound loss especially in mid and high frequency bands. There is no any coupling or cathode capacitor used in this amplifier. Cathode leg of the GM70 power triode is directly connected to ground without any resistor or capacitor. Signal path is very short and design is so simple to provide extremely natural sound. Anode voltages for 6N8S and GM70 are separately provided by mosfet regulated power supply circuits. Filaments of both tubes are separately heated by regulated supply circuits to cancel the hum.

-Type: Mono block Single ended Class A1.

-Output Power: 2x30Watts to 6 or 8 Ohms.

-Feedback: No local or global feedback used.

-Bias: Adjustable fixed bias. One bi-color (Green-red) led and an adjustment trimmer is built on.

-Delay on circuit: Yes

-Tubes: Input tube; 6N8S (6SN7) bacalite base (rare metal base nos 1956 year tubes are optional), Output tube; GM70 graphite plate (rare nos copper plates are optional).

-Output transformer: AE (Well known Hi-end transformer company from Holland) Double C core 0,05mm laminations, max. 45Watts output, 6 and 8 0hms secondary.

-Speaker connectors: Gold plated, heavy-duty.

-Power consumption: 250Watts. 220V or 110V line input will be wired up to your choice.

-Case/chassis: 2cm. thick polished hornbeam massive wooden case and 2mm thick steel chassis.

-Sizes: (Each mono block): 210mm(W) x 420mm(L) x 100mm(H); 19Kg.

igor0203 · 30th January 2009, 10:04 PM

Price?

Plink · 15th February 2009, 08:55 AM

yeah, price? nice amp.

noyan · 15th February 2009, 03:48 PM

Hi,
It was sold already for 3.000 Usd. If you interested in, i can prepare another same. Preparation duration is 3 weeks.
Regards,
Noyan

30th January 2009, 08:14 PM	#1
noyan diyAudio Member Join Date: May 2004 Location: istanbul	GM70 SET direct coupled 2x30W monoblock amplifier I am selling my new custom built GM70 2x30W monoblock set amplifier. Amplifiers as shown in attached actual photographs. It was new built point-to point connections and tested by me. The schematic and user manual document will be supplied with amplifier. Amplifier has very loud and open sound, with lovely midrange and deep bass. Giving huge sound even without clipping. Explanation of design: - Both halves of 6N8S tube are direct coupled to each other. The output of 6N8S tube also direct coupled to GM70 tube by using an anode choke to eliminate the sound loss especially in mid and high frequency bands. There is no any coupling or cathode capacitor used in this amplifier. Cathode leg of the GM70 power triode is directly connected to ground without any resistor or capacitor. Signal path is very short and design is so simple to provide extremely natural sound. Anode voltages for 6N8S and GM70 are separately provided by mosfet regulated power supply circuits. Filaments of both tubes are separately heated by regulated supply circuits to cancel the hum. -Type: Mono block Single ended Class A1. -Output Power: 2x30Watts to 6 or 8 Ohms. -Feedback: No local or global feedback used. -Bias: Adjustable fixed bias. One bi-color (Green-red) led and an adjustment trimmer is built on. -Delay on circuit: Yes -Tubes: Input tube; 6N8S (6SN7) bacalite base (rare metal base nos 1956 year tubes are optional), Output tube; GM70 graphite plate (rare nos copper plates are optional). -Output transformer: AE (Well known Hi-end transformer company from Holland) Double C core 0,05mm laminations, max. 45Watts output, 6 and 8 0hms secondary. -Speaker connectors: Gold plated, heavy-duty. -Power consumption: 250Watts. 220V or 110V line input will be wired up to your choice. -Case/chassis: 2cm. thick polished hornbeam massive wooden case and 2mm thick steel chassis. -Sizes: (Each mono block): 210mm(W) x 420mm(L) x 100mm(H); 19Kg.

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30th January 2009, 10:04 PM	#2
igor0203 diyAudio Member Join Date: Dec 2008 Location: Ljubljana, Slovenia	Price?

15th February 2009, 08:55 AM	#3
Plink diyAudio Member Join Date: Aug 2008	yeah, price? nice amp.

15th February 2009, 03:48 PM	#4
noyan diyAudio Member Join Date: May 2004 Location: istanbul	Hi, It was sold already for 3.000 Usd. If you interested in, i can prepare another same. Preparation duration is 3 weeks. Regards, Noyan

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