John Curl's Blowtorch preamplifier part II

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#72,022
gpapag said:
Lucky
I was surprised when i saw your TL cantilever model (*), Next I was even more surprised reading about the dispersion in your last post.
This clings 'guided waves testing' to me
Click to expand...

Funny coincidence, I was at the MIT DIY flea market yesterday and one dealer had a very small stack of Audio magazine from the 50's. The one on top, June 1953, featured an electro-mechanical phono cartridge model.

EDIT - surprise https://archive.org/details/am-1953-06

Have to love it...
"Therefore, he feels the need to manufacture records for consumers who will ordinarily turn the bass control, if they have one, all the way up and the treble all the way down."
 
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#72,026
scott wurcer said:
Funny coincidence, I was at the MIT DIY flea market yesterday and one dealer had a very small stack of Audio magazine from the 50's. The one on top, June 1953, featured an electro-mechanical phono cartridge model.

EDIT - surprise https://archive.org/details/am-1953-06

Have to love it...
"Therefore, he feels the need to manufacture records for consumers who will ordinarily turn the bass control, if they have one, all the way up and the treble all the way down."
Click to expand...
That's a fun read. The lead piece about patents sounds as if it could have been written yesterday.
 
#72,029
Folks,

I am having an off day. I want to build a frequency shifter in analog. I have a sine-cosine oscillator, a buffered signal, a 90 degree phase shifted signal, multipliers and summing amps. All I want is the lower shifted band. I have done this before but my memory has failed me today. Anyone want to refresh it?

Thanks

ES
 
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