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Old 31st October 2008, 07:26 PM   #1
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Default Dummy load for unknown output impedence

Should be safe to build a 16 ohm dummy load, right? I've got a 1950s Japanese portable reel to reel with a little 2" speaker in it. The belts and rollers are shot, and it's not good enough to be worth fixing, so I just replaced the play head with a 1/4 jack so I can use it as a small amp, which works fine, but I'm thinking it would be a lot more useful with a dummy load so I can use it for distortion and route it to a regular amp. I have no idea what the speaker's impedence is, and more interestingly, there is NO OUTPUT TRANSFORMER whatsoever, which is a new one to me.
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Old 1st November 2008, 07:37 PM   #2
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Is it transistor or valve (tube)?.
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Old 2nd November 2008, 09:08 PM   #3
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It's tube, but I'm thrown off by the fact that it only has one transformer, which appears to be power supply.
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Old 2nd November 2008, 09:41 PM   #4
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Quote:
Originally posted by ALustyGhost
It's tube, but I'm thrown off by the fact that it only has one transformer, which appears to be power supply.

It's likely a line operated device then and that's the output. Bad Karma

Even transistor circuits of the era had OPT's.
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Old 2nd November 2008, 10:23 PM   #5
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It's working fine as a self-contained amp as is, I'll just keep it that way and record with it occasinally, along side my old tube Wollensak.
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