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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 13th Jul 2016, 2:54 pm   #1
AkaiRick
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Default Akai 910 reel to reel recorder - valves

Hi,
I have an Akai 910 that I've owned from new (1968).
Six years ago I stored it in a shed in Cyprus (not ideal).
When I got it out recently, I found that the amplifier is not working.
The motor and mechanics are perfect but no sound. Apart from normal tape operation not working, I tested the Line In and Line Out functions and it's all dead.
I suspect that a valve/s may have failed.
The amplifier is the same as the other vintage Akai machines, M10, etc..
I'd appreciate any advice as to where I could get the valves tested and replaced, if necessary.
I'm in Westbury, Wilts
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Old 13th Jul 2016, 3:39 pm   #2
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Default Re: Akai 910 reel to reel recorder - valves

I'd say the problem is unlikely to be valve failure and replacing them or even getting them tested would be a waste of time and/or money.

First thing to check is whether the valves light up. If not they're unlikely to be all blown unless the recorder has been connected to the wrong supply voltage. It's easy to check heater for continuity using a DMM.

You should also check LT and HT voltages.
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Old 13th Jul 2016, 4:01 pm   #3
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Default Re: Akai 910 reel to reel recorder - valves

I've just looked at the Akai M10 manual and it's all transistor ie no valves. Are we at cross purposes here?
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Old 13th Jul 2016, 4:22 pm   #4
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Default Re: Akai 910 reel to reel recorder - valves

Thanks Graham.
The valves all light up.
Rick
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Old 13th Jul 2016, 4:24 pm   #5
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Default Re: Akai 910 reel to reel recorder - valves

Goofed again!
Thanks
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Old 13th Jul 2016, 4:29 pm   #6
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Default Re: Akai 910 reel to reel recorder - valves

M-8. Two amplifiers on top of each other.
I think all Akai valve recorders were the same or similar.
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Old 13th Jul 2016, 4:42 pm   #7
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Default Re: Akai 910 reel to reel recorder - valves

If ALL the valves light up, including the rectifier, then all LT supplies are present.

The next thing to do is check for HT voltage across C25.

Circuit here:-

http://audiokarma.org/forums/index.p...t-down.460792/
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Old 16th Jul 2016, 12:06 pm   #8
AkaiRick
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Default Re: Akai 910 reel to reel recorder - valves

Thank you everyone. I shall use your expert advice when I'm next united with my 910.

So glad I joined!
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