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Old 12th January 2013, 11:32 PM   #1
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Default Amplifier usefulness

Hey guys I pulled these power transformers from an old HP SHF signal generatorClick the image to open in full size.

Can anyone suggest an amplifier that would would be possible with these guys?
I really don't know where to begin from a design point of view. Any input would be appreciated.
Thanks, JKJr
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Old 13th January 2013, 12:30 AM   #2
DUG is offline DUG  Canada
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Bottom could be used for a headphone amp...series the windings to get a xxVACct.

You have 4 x 6.3V and 2 x 5V. Max current would be of the lowest value. (bottom 6.3V is 1.?A?)

+/-12V reg for final stage and +/-17V for the driver stage...both regulated.

The top one could be used (carefully) for a supply for ESL biasing.
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Old 13th January 2013, 04:58 AM   #3
DUG is offline DUG  Canada
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You might be able to use the bottom one by itself for a ESL headphone amp.

Use a class D stereo amp from the low voltage supplies and drive push-pull tube output transformers and the Bias could be generated by the 375VAC winding.
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Old 13th January 2013, 01:49 PM   #4
DF96 is offline DF96  England
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Could be ideal for building an oscilloscope, or anything else which has lots of small signal valves and needs a little current at rather high voltage too.
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Old 13th January 2013, 02:27 PM   #5
kevinkr is offline kevinkr  United States
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Put them on eBay and get a transformer that suits the project you have in mind. These would be ideal for a scope project or similar, available supply currents are in line with what is required for low power tube gear and filament heating.

The filament transformer in particular may be extremely useful to someone into building tube electronics.

I'm also thinking these transformers might have come out of one of the old big ticket HP RF generators unfortunately. Shame to kill test gear that might be useful to someone else.
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