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Old 18th January 2007, 10:25 PM   #111
anatech is offline anatech  Canada
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Hi d3imlay,
Quote:
2SD555's and 2SB600's were used on the production line in the series II amps.
Interesting. Of course it's hard to tell since most amps I saw had been hacked many times first.

-Chris
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Old 3rd March 2007, 11:17 PM   #112
PB2 is offline PB2  United States
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It seems that there is no concensus on what is a stable configuration using replacement parts, even those suggested by the factory. Makes it difficult to help.

Pete B.
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Old 3rd March 2007, 11:53 PM   #113
anatech is offline anatech  Canada
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Hi Pete,
Quote:
It seems that there is no concensus on what is a stable configuration using replacement parts, even those suggested by the factory.
Just make the most intelligent decision you can at the time and deal with any problems as they come up. The life of a technician.

-Chris
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Old 9th May 2007, 02:27 PM   #114
Netlist is offline Netlist  Belgium
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I found some time to finish modeling the 700B.
Picture is the best I can produce, Transistors are what was reasonably available in Microcap except for the Ge's Q8 and Q9 which are standard models.
I can pass the model text file to anyone interested.

/Hugo
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Old 9th May 2007, 02:31 PM   #115
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Hi Netlist,

I'm interested in SIM results. Are there any data (THD, noise, square-wave responese, etc...) you could share with us?

Thx,
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Old 9th May 2007, 02:32 PM   #116
Netlist is offline Netlist  Belgium
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Device conditions:
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Old 9th May 2007, 02:33 PM   #117
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PS:
Hmmm... Strange.. PL had not used any rail bypass capacitor? Something polyester in 47n-470n the range, optionally bypassed with 10u-100u elkos?
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Old 9th May 2007, 02:50 PM   #118
Netlist is offline Netlist  Belgium
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Gain:
With a 1Khz sine wave of 6.44Vpp at the input the output slightly clips at 189.58Vpp into 8ohm.
If my calculation is correct: VRMS = Vpp * 0.3535, the ouput power would be 561 WRMS.

/Hugo
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Old 9th May 2007, 02:53 PM   #119
Netlist is offline Netlist  Belgium
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sixtek,
In this simulation, I have omitted the PSU caps as this is supposed to be battery operated.
In real life, PL only use two big capacitors, not bypassed.

I can post any results you want, given that I know how to perform them in Spice.

/Hugo
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Old 9th May 2007, 03:11 PM   #120
Netlist is offline Netlist  Belgium
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Square wave input 1Vpp, output 30Vpp.
I'm still searching how to change the frequentie of the square wave model to make it say 10kHz.
Edit: This should be 10kHz.

/Hugo
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