PL 700 II Clair Bros Rising from the Ashes
- Thread starter Peter S
- Start date
They have those switches on ebay new... A little pricey but when you gang both sides together and stick a big snubber across, they will last.... There is a heavy duty switch which will fit the series II, you just need to do a little rework. It takes me about a half hour to do it. I'll try to get a pic later. I'm messin with the Jolly Green Giant which is ALIVE by the way. Pics coming soon.... 
They have those switches on ebay new... A little pricey but when you gang both sides together and stick a big snubber across, they will last.... There is a heavy duty switch which will fit the series II, you just need to do a little rework. It takes me about a half hour to do it. I'll try to get a pic later. I'm messin with the Jolly Green Giant which is ALIVE by the way. Pics coming soon....
Thanks Perry, this is a switch that failed in a 700B that was to be sold the next day, so I robbed my old 700. I am not in a hurry for a replacement and yes, my project was the Clair 700 II, FINALLY working beautifully---and dead silent--with the only reference to ground being the input cables. All the equipment in the rack is mounted on plastic shims and pvc 1/4" (ice maker supply line) sleeves on the screws, so the PL will be mounted that way too.
My next project is WOPL'ing a second Clair 700 II, which should hopefully go a little smoother!
My next project is WOPL'ing a second Clair 700 II, which should hopefully go a little smoother!
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Just day-dreaming before I rip into the second Clair 700 II. The amp just completed is working beautifully. Possibly my imagination or the power of positive thinking but it seems to sound clearer than the quasi-comp 700B that it is replacing, but this is purely subjective.
I am firmly convinced that the fabricated steel shield around the pl 14_20 was a good solution to my noise issue. Shorted input L chan noise went from 3 mV to 1.5 mV. The sides and top of this steel clam-shell were opened slightly from the 90 degree folds pictured. This was to allow ventilation.
My thoughts are to re-route all the AC wiring; have the AC cross from the input side to the transformer side at the latitude of the thermo switches. If the input connections are at the bottom of the pcb, and the input op-amps are at the top, wouldn't ANY location for the AC wiring present an equal noise risk? With the wiring crossing at mid-point, wire runs are the shortest. The Power switch wires could go directly to the transformer side and not "Tee" in, close to the op-amps. Also my (patent-pending) steel clam-shell could then be completely open at the top, as it is at the bottom to alleviate any cooling issues for the control board.
The second amp has a lower 'leakage' issue with the transformer than the amp above, so I will definitely do tests to very that this shield is even necessary on this amp. My main concern is; Any harm in running the AC wires straight across, at mid level?
I am firmly convinced that the fabricated steel shield around the pl 14_20 was a good solution to my noise issue. Shorted input L chan noise went from 3 mV to 1.5 mV. The sides and top of this steel clam-shell were opened slightly from the 90 degree folds pictured. This was to allow ventilation.
My thoughts are to re-route all the AC wiring; have the AC cross from the input side to the transformer side at the latitude of the thermo switches. If the input connections are at the bottom of the pcb, and the input op-amps are at the top, wouldn't ANY location for the AC wiring present an equal noise risk? With the wiring crossing at mid-point, wire runs are the shortest. The Power switch wires could go directly to the transformer side and not "Tee" in, close to the op-amps. Also my (patent-pending) steel clam-shell could then be completely open at the top, as it is at the bottom to alleviate any cooling issues for the control board.
The second amp has a lower 'leakage' issue with the transformer than the amp above, so I will definitely do tests to very that this shield is even necessary on this amp. My main concern is; Any harm in running the AC wires straight across, at mid level?
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Hi WOPL Sniffer, it turns out that as long as the only connection to ground ( the rest of my system ) is through the input cables, everything is fine. I heard something about common mode bla bla bla......So this Perry guy was right after all!
Just so hard to take somebody seriously who paints a 700B lime green....
And BTW-----no acid for years.
Just so hard to take somebody seriously who paints a 700B lime green....
And BTW-----no acid for years.
Hi Peter
Yes the full comp version has better soundstage and clarity than the quasi comp. Even though the quasi comp is quite good, you get a somewhat compressed sound from the quasi-comp negative half transistor configuration that is not there in the full comp version. You are not the only observer of that effect. That is why the backplanes were created, to unlock that presence with a fairly straightforward conversion process.
Yes the full comp version has better soundstage and clarity than the quasi comp. Even though the quasi comp is quite good, you get a somewhat compressed sound from the quasi-comp negative half transistor configuration that is not there in the full comp version. You are not the only observer of that effect. That is why the backplanes were created, to unlock that presence with a fairly straightforward conversion process.