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Frequency Response Power Output @ 20kHz FFT @ 20kHz Right FFT @ 20kHz Left FFT @ 1kHz Right FFT @ 1kHz Left Power Output @ 1kHz Right Signal to Noise @ 1 Watt Left Signal to Noise @ 1 Watt Phase Response @ 1 Watt Stereo, Blue line is phase response Right Channel...

THOSE would be the grand dad of Kaboom...

I did not mean to infer anything... it was late when I posted. The 1 watt frequency response is -3dB on the top and bottom frequency measurements. At 50 watts (8 ohm load), the frequency response is still the same as 1 watt because the slew rate is about 45V/uS. The power bandwidth of this...

Ed, The circuit is being debugged/tested before I get the PCB's made, so yes, the final PCB is coming. I'll post more detailed test info later. Frequency response is referenced to 0dB with 1kHz as the reference. On this amp, I have bypassed the level controls. I never use them (on any amp)...

I know Jim respected Bob highly. When I read the Mount Rushmore quip, Jim B. was the first person I thought of.

I think Jim Bongiorno would disagree... ha ha

I have "grafted" the latest 400-700 driver circuit onto one of my PL36 PCB's and installed a DCP (Thanks to Glen for sending an extra he had). Before I order the PCB's, I want to get a second opinion of the amp performance, so I am sending the entire amp to Glen for his evaluation. I am...

The 2N4401 is a good low noise device as well. It could be used in place of the 2N5172, but mind the pin-out difference. I have used the 2N4401 and 2N4403 in differential front-end circuits and the performance is better than you would expect.

Ed, When I recommended the 100pF caps, I was thinking of the Series ll version. However, you are right, the Series l should use a smaller cap on the pre-driver base to collector predriver transistors. The PL service bulletins were filled with good information, however, one item I find...

If you don't want to spend too much money on the 700, but make it "less of a time bomb", you may want to try the following after getting the amp up and running to original specifications and replacing parts such as the carbon comp resistors and other parts that may have drifted (ceramics caps...

The "theory" is based a few factors... mainly power supply regulation, and amp design. The theory assumes the power supply voltage will not droop and that the amp has enough current gain to drive the load. Most power supplies will droop and the driver and output stage will have beta droop, so...

My stock 700 Series ll that I tested in mono (years ago) put out 1100 Watts RMS into a single 8 Ohm load. This mono test was easy to implement with the AP System One because you can invert one channel from the AP to the amp. Then you simply use the 2 amp "hot" outputs for your load. I used 8...

Thanks Lee, I'll poke around through the various threads. I am only interested in full comp data.

Does any body have test data using the latest WOPL control board and the original PL output circuitry vs WOPL control board w/ backplane boards?

Lee, What is the consensus on the new x-overs? Sound, power handling, etc?

I would say there is nothing to gain from using resistors with non-magnetic leads or end-caps. Just a hand grenade audio-phools throw out there to make the water more muddy.

Hi Ed, - S/N spec is weighted, but I can certainly do un-weighted. - The power bandwidth would be -3dB at rated power for the 700. For the 400, the power bandwidth would be a bit better due to less power and more headroom on the slew rate. - Channel separation should be as good as the...

Boards will be made here in the US.

I am going to order boards for my new PL amp design soon. I need 15 for my heard. Preliminary Specs (Will be finalized when PCB's come in and testing begins) 100kHz power bandwidth (I don't recommend trying to get 350 Watts out at 100kHz, but it should do it, in theory) Slew rate - 37 V/us...

Maybe in a former eastern bloc country, the former Soviet Union or Nazi Germany.