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In the Forum: Melquiades Amplifier
In the Thread: The 6E5P tube data.
Post Subject: Full power bandwidthPosted by hagtech on: 2/21/2008
Ok, I did it a little different this time.  At full power levels, the dB meter still showed wideband response.  However, looking at the scope I could see distortion in the waveform.  So instead, I lowered the input level to -3dB from full power at 1kHz.  Then I swept frequency to where I could see the onset of distortion.  These points were at 25Hz and 19kHz.  So I suppose you could call this the "full power undistorted bandwidth".  Minus 3dB points, anyway.  Here's shot of the machine showing the 19kHz waveform.



This does not qualiify as an SE amp.  I run the output tranny as PP, no dc flux.  That's a significant advantage for bandwidth.  The 1615 tranny is quite small.  My one and only SET project achieved 65kHz at 1W through a UBT-3.

Clarion

jh

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