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Re: [ARSCLIST] LP pressing question



One other note about "classic" tube amps: most had pretty severe limiting (or roll-off) networks built into the input circuits. Remember that "back in the day", designers probably weren't going for flat response from 20Hz-20kHz. Adequate performance was 40Hz to 10kHz. They didn't see the point in the amplifier amplifying "noise", so they limited the response of the circuit. Most "classic" sounding tube pieces can have the limiting circuit modified or even removed and have the overall feedback loop reduced (by feeding the amplifier a 10kHz square wave and reducing feedback until ringing occurs on the 'scope, and then adding some feedback back into the circuit). After the feedback is reduced, worn out parts are replaced and the limiting circuit modified, you'd be surprised how much of the "classic" tone disappears.
Phillip


Steven C. Barr(x) wrote:
----- Original Message ----- From: "Roger and Allison Kulp" <thorenstd124@xxxxxxxxx>
I have never seen an RCA stand-alone amp,like the one seen at 4:01 in this
clip.Once in a very rare while,I will see an older RCA amp,made for movie
theaters.I had one once,circa 1943.I found it in a dumpster in
1988.Unfortunately,someone stole it from me when I was moving,a few years later.
once.I had an RCA tube tape deck like that,and sold it on eBay,in 2005.
Note that there was also an amp intended for home-movie use, for which the
speaker cabinet was boldly labelled "Victor" in metal letters mounted in
front of its grille cloth; this was NOT "RCA Victor" and, indeed had no
connection with that firm.


I have one of the cabinets (speaker long since defunct)...and have seen
one other such...

Steven C. Barr



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