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Old 1st June 2004, 03:54 PM   #21
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Hi Dioklecijan


Your web site has fascinating subjective descriptions of the effects of SRPP and generally opamps, which i am fully in agreement with. Unfortunately i couldn't find anything about your implementation of the SRPP stage. Does it replace the output opamp?

regards
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Old 1st June 2004, 06:27 PM   #22
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Yes!

Administrator of this site is Bojan Hajdinjak, audio constructor, he write about SRPP.
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Old 1st June 2004, 09:08 PM   #23
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Default Just of curioucity

I see that you are using a wooden frame....
How does it perform without all metal chassis shielding ??
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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
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Old 1st June 2004, 09:48 PM   #24
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Fantastic!

This is really quiet preamp. No hum, no noise, nothing. In MC position, at full volume, you must place ear about 20 cm behind speakers to hear anything.
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Old 3rd June 2004, 05:18 AM   #25
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This looks suspiciously similar to my Bugle phono stage, or perhaps great minds think alike?

Bugle Phono

One problem is R12. It's value should be a little higher because it is in parallel with R14, at least in terms of the proper time constant. That's why I used 8.45k.

jh
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Old 3rd June 2004, 05:43 AM   #26
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Thanks Hagerman for your suggestions.
Yes, my phono is very similar with your Bugle. With opamps all good phono preamps will be similar.
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Old 4th June 2004, 09:13 PM   #27
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To hagtech : Opamps of OPA 13... family are not so good as phono preamps, 'cos they have relatively high noise - try on first position OPA 627. Also + / - 9V is not enough for good overload.
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Old 5th June 2004, 06:58 AM   #28
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To dioklecijan : Try to change time constant : tau 1 + 2 beside first stage, tau 3 beside second - you get better SNR.
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Old 5th June 2004, 08:29 AM   #29
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Yes I do.

As you see.
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Old 19th July 2004, 07:58 AM   #30
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Hello,

sorry but this link is dead http://www.hiendfi.com/modules.php?...article&sid=102

Pascal.
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