Hi All,
I picked up this amplifier (well . one like it ) at a local auction.
It was very cheap.!!
Does anyone have the schematic for it??
There are many versions under different names - some with bluetooth.
Specifications
Power Supply: 220V-240V / 50-60Hz
Output power: 25W+25W
Input power: 100W
Input impedance: 47k ohm
Input sensitivity: 300mV
SNR: > 80DB
Frequency response: 28Hz ~ 20KHz
Output impedance: 4 ~ 16ohm
Dimensions(D*W*H): 312 * 270 * 150 mm
Weight: 6Kg
Tube: Beijing 6N1*2 + 6P1*2
Cheers
I picked up this amplifier (well . one like it ) at a local auction.
It was very cheap.!!
Does anyone have the schematic for it??
There are many versions under different names - some with bluetooth.
Specifications
Power Supply: 220V-240V / 50-60Hz
Output power: 25W+25W
Input power: 100W
Input impedance: 47k ohm
Input sensitivity: 300mV
SNR: > 80DB
Frequency response: 28Hz ~ 20KHz
Output impedance: 4 ~ 16ohm
Dimensions(D*W*H): 312 * 270 * 150 mm
Weight: 6Kg
Tube: Beijing 6N1*2 + 6P1*2
Cheers
Attachments
If i remember correct you can pull the tubes and it still sounds the
way it sounds.
Hint : There is no way a Single ended tubeamp can have a efficiency
of 50% as the above figures claims.
yes this is a fake tube amplifier - there are no output transformers - just empty decorative cover. SS amplifier with tubes.
Exposure of fake Chinese tube amplifier Nobsound MS-10D MKII. - Stereo Amplifiers & Pre-Amps - StereoNET
but I have seen that a real DIY tube amplifier is built into this chassis
but I have seen that a real DIY tube amplifier is built into this chassis
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I was hoping to use the chassis for a "REAL" tube amplifier.
I knew it was a fake when I bought it hence the cheap price I paid ( £10 )
Andy
I knew it was a fake when I bought it hence the cheap price I paid ( £10 )
Andy
If you're going to gut it, then you don't need a schematic do you.😉
The chassis is probably just big enough for a single ended EL84 amp.
jeff
Original A Sound Concertina consist of two indel PP 20W 10K output transformers on top and one indel toroid for B+ and heaters at the bottom. Output was about 2x7W if i remember correctly....Their web page is down ...
In similar size enclosure i mounted PP gu32 amplifier - yes little space ( i hate small enclosures 😀 ) but indel 20 W PP transformers + power transformer fit there.
In similar size enclosure i mounted PP gu32 amplifier - yes little space ( i hate small enclosures 😀 ) but indel 20 W PP transformers + power transformer fit there.
Attachments
A new, simple, face plate with only the power switch and volume control is (IMO) part of making that case work genuine "hollow state". Eliminate the unsupportable cosmetic "baloney".
Perhaps an additional Noval (9 pin mini) socket at the center front of the top panel, for 2X (1 per channel) 12AX7/ECC83 section voltage amplifiers. PP 6BQ5/EL84 "finals" go in the already present sockets. FWIW, I'm thinking of circuitry along the general lines of the Dyna ST-35. Use ZVN0455A "concertina" phase splitters. Yes, some "sand" in the direct signal path, but it's being useful in economizing the limited available space. Being (more or less) heaterless pentodes, FETs do not cause me the distress that BJTs do. Voltage controlled, high impedance, active devices in the signal path, for me.
Perhaps an additional Noval (9 pin mini) socket at the center front of the top panel, for 2X (1 per channel) 12AX7/ECC83 section voltage amplifiers. PP 6BQ5/EL84 "finals" go in the already present sockets. FWIW, I'm thinking of circuitry along the general lines of the Dyna ST-35. Use ZVN0455A "concertina" phase splitters. Yes, some "sand" in the direct signal path, but it's being useful in economizing the limited available space. Being (more or less) heaterless pentodes, FETs do not cause me the distress that BJTs do. Voltage controlled, high impedance, active devices in the signal path, for me.
OK. It's not a tube/valve amplifier.
Can anyone suggest/post a simple schematic using the existing tubes?
Andy
Can anyone suggest/post a simple schematic using the existing tubes?
Andy
As far as I understand this thing doesn't even have output transformers, and the power transformer is low-voltage one, right?
Well, 6P1 is basically the 9-pin 6V6 with slightly lower ratings (250V max), so almost any 6V6 SE amp schematics will do (triode or tetrode strapped - depends on your needs, maybe even UL if the transformers have the right taps - you'll need about 20-25%)
Designing the driver stage around the 6N1 shouldn't be a problem either.
Designing the driver stage around the 6N1 shouldn't be a problem either.