Strange Heater voltage on a Marstran 1202-118?

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Strange Heater voltage on a Marstran 1202-118?

Postby visualdistortion » Sun Mar 06, 2016 7:11 pm

Hi, I've worked on a 50W 2204 amp and after testing all differents voltages, I got 3.35V on pin I & K on the transformers, normally I think it's 3.15V.
This is a problem? Can I remedy to this?
Thanks a lot
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Re: Strange Heater voltage on a Marstran 1202-118?

Postby David B » Mon Mar 07, 2016 6:08 pm

6.7v though a bit high is still in spec for the heater voltage. IIRC within 10% is OK but 5% would be preferable.

What's your wall voltage ?
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Re: Strange Heater voltage on a Marstran 1202-118?

Postby visualdistortion » Mon Mar 07, 2016 7:57 pm

I wired the amp to the 220V wire, but apparently in my house it's 226V.
In France the wall voltage can vary from 218V to 241V.
Maybe use the 230 input will be better.
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Re: Strange Heater voltage on a Marstran 1202-118?

Postby Brian Wallace » Tue Mar 08, 2016 10:40 pm

Wall voltage will change the secondary voltage. Were there tubes installed when you checked the heater voltages?
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: Strange Heater voltage on a Marstran 1202-118?

Postby visualdistortion » Thu Mar 10, 2016 1:59 pm

I think it was with no tubes on it.
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Re: Strange Heater voltage on a Marstran 1202-118?

Postby Brian Wallace » Thu Mar 10, 2016 9:18 pm

The heater voltage will be higher without a load on it. Installing the tubes should drop it down a bit but as mentioned above, the wall voltage has an impact on all the secondary voltages.
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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