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Sets, Parts and Service Information Offered (private sellers only, exact price required, no swaps) You may announce components or sets for sale or offered free here. Private collectors only - no traders. You must include an exact price. No swaps.

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Old 13th Apr 2021, 3:25 pm   #1
newlite4's Avatar
Join Date: Nov 2003
Location: Bath, Somerset, UK.
Posts: 1,536
Default QUAD II Power Amplifier

This is the unit featured in this thread The amplifier has been returned to its original spec. The additional level pot and RCA connector have been removed and the holes covered with an aluminium label, input is now as designed via the 6 way jones plug. R12 has been replaced with the correct 180 ohm resistor. C1 has been replaced although C2 and C3 have been left since these are special screened types and are of the more reliable "can and bung" type. The factory set 15 ohm output impedance has been adjusted on the output TX for 8 ohm to make future use of this amplifier more convenient. On test the amplifier works very well indeed. When driven into clipping there is still a slight 50kHz ring on the leading edge of the positive half cycle but this is unlikely to be noticeable during normal use. I did swap all valves over to try to eliminate this but consider this to be due to circuit layout rather than to poor component performance.
Price for this amplifier is 350 (cash only) and due to its weight and delicate nature would need to be collected. I am located on the eastern edge of Bath with good links to M4, A46 and A4.
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preserving the recent past, for the distant future.
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Old 13th Apr 2021, 7:28 pm   #2
trickie_dickie's Avatar
Join Date: Jan 2011
Location: Aberdare, South Wales, UK
Posts: 379
Default Re: QUAD II Power Amplifier

That's a generous price for a Quad II. One could not be built for that price.
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