labjr said:
Because that's what it shows in the manufacturer's application notes.
In the early 70's I designed a cute common-base moving coil preamp.
"You obviously don't know how to hook up a transistor!", they said.
If John Curl's mc stage hadn't been potted, they probably would have
said the same thing.
When I did the no-feedback common-gate I/V converter for the D1,
I showed it to several (then successful) companies that made DACs.
"That Can't Work!", they said. All their op amp I/V's were straight
out of the app notes.
When the RCA transistor manual was issued in the 60's, it showed a
nice little quasi-complementary power amp design. The Citation 12
came out and had the identical circuit. Bob Carver built a bigger
version, and it was years before designers stopped copying the
original RCA.
And that's why they still use output coils, sez I
Nelson Pass said:
Because that's what it shows in the manufacturer's application notes.
In the early 70's I designed a cute common-base moving coil preamp.
"You obviously don't know how to hook up a transistor!", they said.
If John Curl's mc stage hadn't been potted, they probably would have
said the same thing.
When I did the no-feedback common-gate I/V converter for the D1,
I showed it to several (then successful) companies that made DACs.
"That Can't Work!", they said. All their op amp I/V's were straight
out of the app notes.
When the RCA transistor manual was issued in the 60's, it showed a
nice little quasi-complementary power amp design. The Citation 12
came out and had the identical circuit. Bob Carver built a bigger
version, and it was years before designers stopped copying the
original RCA.
And that's why they still use output coils, sez I
I'm surprised they doubted your idea with the D1. After all it wasn't the first time you challenged the status quo.
BTW, I thought Bob Carver was a guru with the magnetic field amplifiers and all.
phase linear and bob carver
fond memories of the mid seventies- I was there and I can remember them-somewhat
the pro sound setup we had for my colledge was a tapco mixer with a phase linear amp over lascalla speakers- loud as hell and terrible sounding- highs that could rip your ears off-
sadly i bought a mac 275 for the monitors-
i think the sound on stage was WAY better than what i subjected the audiences to-
unfortunealy I was in the middle of the audience with my sound board-
la vie
rob
fond memories of the mid seventies- I was there and I can remember them-somewhat
the pro sound setup we had for my colledge was a tapco mixer with a phase linear amp over lascalla speakers- loud as hell and terrible sounding- highs that could rip your ears off-
sadly i bought a mac 275 for the monitors-
i think the sound on stage was WAY better than what i subjected the audiences to-
unfortunealy I was in the middle of the audience with my sound board-
la vie
rob
Nelson Pass said:
That would be later. In the early 70's it was Phase Linear 400.
I remember Phase Linear when loud was in. Tech Hifi used to sell it in Boston area. I worked on a fair amount of it years ago. Cheapo parts inside.
I was being sarcastic with the guru remark. I've always thought everything associated with Bob Carver with was inferior. A glut of patents for the smoke & mirrors and lots of marketing, but failed to impress audiophiles.
I consider Bose the same but maybe a step up.