Amp Shutting Down, need help

First off, Sailcappy, I (we) appreciate your patience and cooperation with all the requests from "The Brain Trust" (SCRUBS). Other than Jim's latest request(s) below, and based on what’s been tried and confirmed so far, I think we all will agree that an oscilloscope would be beneficial/essential at this juncture to diagnose mutually-suggested D.C. and noise suspicions, of which you mentioned that your friend, who works for the power company (aka;” Ken”), was trying to obtain one.

08-22-12: Jea48 “…Just move the hot conductor of the audio 20 amp dedicated circuit to another 20 amp breaker on the other Line, leg, bus in the electrical panel. (Providing there are any spares. If there is not a spare he could use a breaker that is being used, for the test.”

and...

”I would sure like to know what the VD, voltage drop, looks like at the end of the 50' 16/3 cord as the Cary amp is going through its active start up cycle...... Especially that last relay click you hear.”

Jim, wouldn’t his other “standard 15 amp” outlets, throughout the apartment, be split up between the two incoming legs? He has tried, unsuccessfully, to energize the amp from various 15 amp locations around the apartment, though it isn’t known how they are split up.

Frank

PS; Thanks Jim/Al for the "quoting" assistance. I'll take my sign off.

Jea48, thanks for that note. In that case, I suspect that the DC blocker circuit has developed a malfunction. It would not be missed if the AC line were clean.

Its easy enough to test for. There is someone on this forum who makes AC extension outlets that have the DC Blocker built in. Just use one of those and you would know if that's what it is.

The lack of AC grounds in the wiring is disturbing, but it should not cause any troubles with the amp.

08-18-12: Metro04

"I'd really like *him* to re-check the voltage from the outlet's LINE (smaller slot), to the GROUND pin and report the voltage. He's previously stated there's no stray voltage between the NEUTRAL and GROUND, so I'd like him to check for "resistance" between the outlet's NEUTRAL (larger slot)and GROUND if able."

08-21-12: Sailcappy

“6. Voltage from the “smaller" slot to the "ground" slot is 118 volts.
7. Resistance (Using the Omega setting on the volt meter) between Neutral (Large Slot) and Ground slot jumps between 13 and 17 units.”

08-22-12: Atmasphere

“The lack of AC grounds in the wiring is disturbing, but it should not cause any troubles with the amp.

Atmasphere, This was something I pushed to verify - lacking any knowledge of Cary’s circuit topologies - and *can* be of issue with some equipment designs (audio equipment aside). Sailcappy’s stated measurement of 13-17 ohms seems a tad bit high for 10 AWG, but based on the Neutral wire’s length alone, and various metal conduit mechanical connections, might be expected. Really don’t know for absolute if that amount of resistance poses an issue for that *particular* amp.

Just curious is the multi meter voltage section reading true RMS?

Yes it reads true RMS.

Its easy enough to test for. There is someone on this forum who makes AC extension outlets that have the DC Blocker built in. Just use one of those and you would know if that's what it is.
08-22-12: Atmasphere

Atmasphere,

Agree....

The Agon's members username is Gbart.

Email address, sae2300@optimum.net



>>>>

Jim, wouldn’t his other “standard 15 amp” outlets, throughout the apartment, be split up between the two incoming legs? He has tried, unsuccessfully, to energize the amp from various 15 amp locations around the apartment, though it isn’t known how they are split up.
Frank
08-22-12: Metro04

Frank,

Maybe.... But not necessarily. Back in the 1970s it was not uncommon to put most of the 15 amp convenience outlets in the living room and bedrooms on the same 15 amp branch circuit. Sailcappy had a 50/50 chance the circuit/s is/are fed from the other Line.

Sailcappy could check if the receptacle/s he plugged the amp into is fed from the same Line, leg, as the dedicated circuit.
Each breaker space down each side of the panel alternates from one Line to the other.

Example Line 1, L1, is the top breaker as well as the top breaker across from it.

2nd breaker down is fed from L2 as well as the one across from it.

And so on down each side of the panel.

Glad you brought up again that Sailcappy tried other outlets in his apartment.... Those in the living room as well as bedrooms are more than likely 15 amp branch circuits fed from a 15 amp breaker....

Sailcappy, is that correct? A 15 amp breaker? IF 15 amp, during the test, did the 15 amp branch circuit breaker ever trip?

I should mention, the breakers in the panel are thermal/magnetic type breakers.
.