Forgot about that. That explains a lot about why iso's have gone out of fashion. My wiring has been more creative and with larger transformers. Yes, I should have said neutral instead of negative.
Isolation Transformer - Use with Cheater Plug
If you plug equipment into a isolation transformer like a Tripp-lite using cheater plugs, do you still get the shock benefit? I am thinking you are because the transformer is still plugged in the correct, grounded way. But technical knowledge has never been one of my strengths.
(The only way I can prevent loud hum is by using cheater plugs on both my preamp and amp. Plugging them into the Tripp-lite without the cheater plugs did not work.)
(The only way I can prevent loud hum is by using cheater plugs on both my preamp and amp. Plugging them into the Tripp-lite without the cheater plugs did not work.)
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Thanks for the responses. I originally had the pair plugged into the same outlet with the cheater plugs. (I did not have this problem until I replaced my previous power amp.) Without the cheater plugs, the hum is very loud. Sorry to still be confused - I didn't word my original question very well. Since the Tripp-lite did not solve my ground hum problem, is it at least giving me some protection from shock since I have to use the cheater plugs one way or the other? Or should I just go back to plugging the pair straight into the wall outlet and try something else? (I might try isolating the RCA cords next.) Thx again. |
HHawk: I guess you missed Jea48's humour. Yes, you can still get a minor shock. The iso will reduce common mode noise in the AC line and reduce voltage spikes. Sizing is important. For both a preamp and amp, 1 KVA is minimal. You might want to do some search and research into "ground loop" Rives: You guessed right. Shhh. |
A balanced power system is still a grounded AC power system, (60/120Vac). True both 120V legs are ungrounded with a reference from each leg to the grounded neutral of 60V. The neutral is still connected to earth ground per NEC Article 647. ~ ====================== I originally had the pair plugged into the same outlet with the cheater plugs. (I did not have this problem until I replaced my previous power amp.) Without the cheater plugs, the hum is very loud. Hhawk, Are you saying with all the associated equipment, that is connected together by ics, plugged into the same outlet without using ground cheaters you get a loud hum? By Chance do you have a CATV system hooked up to the audio system in any way? |
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