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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 16th April 2019, 09:18 PM   #221
Perry Babin is offline Perry Babin  United States
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The voltage (that low) on the shields isn't a problem.

Of all 6491s have DC across the emitters but none of the 6488s do, I'd suspect a short or other current-passing fault from the collectors of the 6491s (or something connected to them) to... I don't know. It could be anywhere.
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Old 19th April 2019, 08:52 PM   #222
Chopperbuilder is offline Chopperbuilder  United States
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Still chasing that moving target.

This is where I'm at with it now. Pin 4 of the 494 is still a bit high at +0.179v, with no resistor between pins 4 and 7.

All emitter resistors are at 0.000v with amp at idle no speakers hooked to it. However the left side 6491 emitter resistors are at +0.004v with speakers connected, amp at idle. All the other emitter resistors hold at 0.000v with speakers connected.
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Old 19th April 2019, 09:00 PM   #223
Perry Babin is offline Perry Babin  United States
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That sound like you have DC offset on the left channel. It's probably positive voltage. IF you check for it, check with and without the speaker connected.
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Old 19th April 2019, 09:18 PM   #224
Chopperbuilder is offline Chopperbuilder  United States
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Got the following DC offset voltages.


Right side/no speaker connected +0.065v.
Right side/speaker connected +0.065v.


Left side/no speaker connected -0.325v pulsing.
Left side/speaker connected -0.225v pulsing.
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Old 19th April 2019, 09:24 PM   #225
Perry Babin is offline Perry Babin  United States
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What changes if you disconnect the 2.7 ohm resistor between the 5534 and the 4 diodes.
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Old 19th April 2019, 10:10 PM   #226
Chopperbuilder is offline Chopperbuilder  United States
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With the 2.7 ohm resistor between the 5534 and the 4 diodes disconnected the DC voltage on the left speaker leads is -0.495v and slowly drops towards -0.500v and below.
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Old 19th April 2019, 10:50 PM   #227
Chopperbuilder is offline Chopperbuilder  United States
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Also the voltage across the 6491 emitter resistors, with speaker connected, dropped to 0.000v.
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Old 20th April 2019, 04:18 AM   #228
Chopperbuilder is offline Chopperbuilder  United States
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I replaced the 5534 and the DC offset is now:
Right side/no speaker connected +0.065v.
Right side/speaker connected +0.065v.

Left side/no speaker connected -0.055v.
Left side/speaker connected -0.055v.

The DC voltage across the left side 6491 emitter resistors are back at 0.003v. All the rest are at 0.000v. Also noticed the left side output transistors are heating up when the amp is playing. The right side is not.
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Old 20th April 2019, 06:13 AM   #229
Perry Babin is offline Perry Babin  United States
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1. Where are you placing the black probe when measuring voltage?

2. Is the 2.7 ohm resistor back in the circuit?

3. Which channel are you referring to as 'right'? Orange or yellow/black?

4. Was the speaker connected when you read 0.003v on the emitter resistors for the 6491s?

5. It's likely that only the 6491s are heating. Is that right?

6. Do they heat at idle with no speaker connected?
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Old 20th April 2019, 09:34 AM   #230
Chopperbuilder is offline Chopperbuilder  United States
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1. As to where I place the black probe depends on the circuit. Power side - on the negative terminal, audio side - on the RCA shields. For the DC offset it was on the black speaker leads.

2. Yes, the 2.7 ohm resistor is back in the circuit.

3. I'm referring the yellow as the right channel.

4. No, the speaker was not connected when I read 0.003v on the emitter resistors for the 6491s.

5. As to only the 6491's heating up it would make since but I couldn't tell for sure as I have the amp clamped to the heat sink. From what I could tell, it felt like both the 6488's and 6491's on the left side where heating up.

6. They do not get hot at idle with no speaker connected.
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