Death of Gain Clone

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#181
mastertech said:
Hi widowmaker you know my friend jean once told me that
a highend amp should be wideband, is yours such an amp
take a look at the stereophile amp of the year Dartzeel has
wide frequency response, that means my friend jean is
right

regards
Click to expand...

Sound diapason is: 20Hz-20000Hz...
We're talking about audio amplifier, not about RF...
High End... what is really means High End?
Just take a look...


GU81M_6C33C_i_E80CC.sized.jpg
 
#182
Ah Yes,

WM, 833 driven by a 6C33B - what are the voltage amplifiers?

No forced air cooling, would that be around 50W?

BUT, this is a very different amp to your error correcting beauty - this has quite a bit of harmonic generation.

Can it compare, particularly on complex orchestral music?

Cheers,

Hugh
 
#197
My simulations suggest that you need to adjust the 47R resistor for the limited openloop gain of the amplifier. A slightly lower value is needed for a lower openloop gain. As openloopgain goes to infinite, the optimum resistor value apraoches the theoritical value: the ratio of the impedances (Rfb1 / Ind) = (Cap/Rfb2).

correct DoGCmaker?

grzz,
Thijs
 
#198
Peter Walkers patent lapsed a few years ago, odd that there have not been a few commercial examples since then.

You can see in the revision history of the Quad 405 and its decendants that the "dumping" output stage was gradually biased from the original "big deadzone" to almost class AB.

Hobbyists can grab some interesting jfets including an n channel matched dual from any old Marantz CD player HDAM module
 
#200
The inductor was an elegant way of getting the Zobel network that you need anyway and low frequency efficiency. The real Quad inductor had a parallel resistor to damp its self-resonance.

The weakness of the original Quad 405 was the LM301 opamp in the front.

Selamat tahun baru
 
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