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Big Bad Bob Big Bad Bob is offline
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Default The most important tubes ever made.....

On 02/02/19 17:26, wrote:
Big Bad Bob wrote:



And of course a guitar amp is probably going to be designed to pass a
more limited frequency range. You can see that when you look at
replacement output transformers, typically rated for 100Hz to maybe 4kHz
as opposed to a 20Hz-20kHz range for hifi/stereo amplifiers.


** The output transformers used in tube guitar amps are normally a lot better than you suggest.

Eg: A Marshall 50W output transformer has its upper -3dB point at 45kHz.

The small signal, low frequency response is -3dB at 1Hz (yes, one Hertz) but core saturation at rated power becomes dominant below about 5OHz.

IME most output transformers used in brand name amps have similar specs.


hmmm, that goes against what I've read over on 'amplifiedparts.com' for
'original replacement' transformers, as opposed to the ones made by
Hammond (which are nearly always better).

the DC blocking capacitors in guitar amps _are_ de-rated a bit over what
you'd see in a hi fi system, last I went through one. Tone controls are
also a little strange compared to hi fi equivalents. But it's part of
"the sound" [and also costs less, which I think is what drove it].