RE: Eico HF-32 PEC Loudness Circuit

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Posted by strijw426 (A) on March 26, 2015 at 11:54:04

In Reply to: Eico HF-32 PEC Loudness Circuit posted by strijw426 on March 25, 2015 at 13:42:06:

Chip;

The loudness circuit you referenced does have some interesting data associated with it. However, I still wish to learn the internal values of the old parts for posterity and to help others in restoring one of these in the future. I am updating the schematic data in the service manual *.pdf file I have on the unit.

I have seen many volume controls with a single loudness tap, but this one is new to me since it has two taps. I may have to find another person with the same model and access to ohm meter and capacitance meter to check the internal parts values. I do not actually have an EICO HF-32 at this time to examine myself, otherwise I would have done so and measured the components without requesting assistance.

I am a member of the Fun With Tubes group on Yahoo, and they have some excellent data on practical tone control circuits.

Thanks for the reference and I have added that to my files.

Joe

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Follow Ups Full Thread

Topic - Eico HF-32 PEC Loudness Circuit - strijw426 13:42:06 03/25/15 (11)

RE: Eico HF-32 PEC Loudness Circuit - strijw426 04:25:02 03/27/15 (3)

HK Loudness Circuit - Triode_Kingdom 09:16:55 03/28/15 (2)

RE: HK Loudness Circuit - strijw426 14:25:20 03/28/15 (1)

Here's one more... - Triode_Kingdom 09:26:28 03/29/15 (0)

RE: Eico HF-32 PEC Loudness Circuit - strijw426 11:54:04 03/26/15 (3)

RE: Eico HF-32 PEC Loudness Circuit - DAK 12:31:36 03/26/15 (2)

RE: Eico HF-32 PEC Loudness Circuit - strijw426 14:48:32 03/26/15 (1)

External Measurements - Triode_Kingdom 15:48:50 03/26/15 (0)

RE: Eico HF-32 PEC Loudness Circuit - strijw426 14:35:48 03/25/15 (1)

RE: Eico HF-32 PEC Loudness Circuit - Chip647 04:45:48 03/26/15 (0)

RE: Eico HF-32 PEC Loudness Circuit - Chip647 14:18:15 03/25/15 (0)

Follow Ups

RE: Eico HF-32 PEC Loudness Circuit - strijw426 11:54:04 03/26/15 (3)

RE: Eico HF-32 PEC Loudness Circuit - DAK 12:31:36 03/26/15 (2)

RE: Eico HF-32 PEC Loudness Circuit - strijw426 14:48:32 03/26/15 (1)

External Measurements - Triode_Kingdom 15:48:50 03/26/15 (0)

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