MH's ideal coil and voltage question

[poynt99]

Yes I can understand why. Higher operating voltage for all the class A preamps would improve the signal to noise ratio with the higher gains that could be achieved plus the wider dynamic range. The jfets used back when had a Vds of ~30v so the signal swings were puny compared to say a 12AX7A or 7025.

I will be designing around a +18V supply for the preamp stages, and +24v (to start) for the output amplifier.

Output amp will be a full bridge switching type, hence the need for only 24V. CFB will be implemented to achieve an Ro of about 5R.

[picowatt]

For audio "Hi-Fi", yes of course. For the "clean" channel of a guitar or bass amp, yes to a degree.
The amp is certainly 50% of the guitarist's "tone".

Pre/Pwr tubes and OPT's are obsolete, as I hope to prove in the near future.

I hope you appreciated the somewhat sarcastic humor from the standpoint of a sound man.  Been there done that...

I am, however, curious.  How do you intend to "prove" the obsolescence of Pre/Pwr tubes and OPT's?

Subjective listening tests or the use of a more "measured" approach?

PW

[picowatt]

I will be designing around a +18V supply for the preamp stages, and +24v (to start) for the output amplifier.

Output amp will be a full bridge switching type, hence the need for only 24V. CFB will be implemented to achieve an Ro of about 5R.

Switching amplifier?  All I can think of in response to that is "yuck".

But then, as I said, guitar "amplifiers" were never really meant to be "amplifiers".

Just giving you a hard time...

PW

[partzman]

Dynamic range?  In a guitar amplifier?  Surely you jest...

PW

No not really! My goal was to manufacture the most "musical" instrument amplifiers I could in both solid state and tube. The brand name was Spectra and at one point Gibson wanted us to manufacture our amplifiers exclusively for them to market with their guitar line which was not financially feasible for us at the time.  Later sold the business to Dean Markley and it took him less than two years to run it into the ground.  End of story.

pm

[picowatt]

No not really! My goal was to manufacture the most "musical" instrument amplifiers I could in both solid state and tube. The brand name was Spectra and at one point Gibson wanted us to manufacture our amplifiers exclusively for them to market with their guitar line which was not financially feasible for us at the time.  Later sold the business to Dean Markley and it took him less than two years to run it into the ground.  End of story.

pm

Interesting...

Were the Spectra series amps by DM your designs or did DM just use the name?

And "JMF" would be ...?

PW