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Old 10th November 2017, 02:26 PM   #21
JonFennell is offline JonFennell
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They both read zero ohms from pin 2 to the pad.
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Old 10th November 2017, 02:43 PM   #22
Perry Babin is offline Perry Babin  United States
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reread
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Old 10th November 2017, 04:54 PM   #23
JonFennell is offline JonFennell
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Rect 1 reads 1.8 ohms from pins 1 and 3 to B+
Rect 2 reads 5 ohms from pins 1 and 3.
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Old 10th November 2017, 04:56 PM   #24
Perry Babin is offline Perry Babin  United States
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how about from the center pad to b+?
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Old 10th November 2017, 05:46 PM   #25
JonFennell is offline JonFennell
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I can't get any kind of sensible reading from the center pin back to B+, Perry. This meter is not the best.
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Old 10th November 2017, 05:54 PM   #26
Perry Babin is offline Perry Babin  United States
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Ok. lets try this.

For the output transistors on either side, half (low side) will have their center leg connected to the 3rd leg of the other half (high side).

For the high side, the center leg will be connected to the center leg of the positive rectifier.

The 3rd leg of the low side will be connected to the center leg of the negative rectifier.
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Old 10th November 2017, 05:59 PM   #27
JonFennell is offline JonFennell
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OK, broke out a 1970's KEW -66 analogue meter. My Dad's.
Rect 1 is around 300 Ohms
rect 2 is around 1000 Ohms
From center pin pad to B+
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Old 10th November 2017, 06:04 PM   #28
JonFennell is offline JonFennell
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aha!
Rect 1 is positive by that reasoning. Does that match your expected resistances to B+
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Old 10th November 2017, 06:09 PM   #29
Perry Babin is offline Perry Babin  United States
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I thought that I would be able to tell from the B+ to the rectifiers but the readings were not what I expected. The readings to the outputs is definitive.
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Old 10th November 2017, 06:18 PM   #30
JonFennell is offline JonFennell
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I'm still not confident enough about rectifier circuits to know which way round these two diodes fit Perry! But I think, from your amp guide and some common sense that the
FEP17CT diode (as it will allow positive current flow through)
Am I right?
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