Search found 700 matches

by Gold
Wed Jun 03, 2015 8:06 pm
Forum: Document
Topic: Holman, Dynamic Range Phono Preamplifiers, Audio July 1977.
Replies: 6
Views: 11290

Re: Holman, Dynamic Range Phono Preamplifiers, Audio July 19

In fact most High Trackability cartridges have too much compliance (see later) A non-intuitive point is that the compliance resonates with the tip mass, usually within the audio band so a lower compliance often helps trackability . I'm glad to see this in print. I have come to the same conclusion. ...
by Gold
Thu May 21, 2015 10:43 am
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

The noise spectrum of buzz and hum is very different from rumble, pops and ticks. I'd expect to easily hear improvements. A good record should have a noise floor of about -65dBu. I'm seeing that -65 dBu number and wondering how far above 0 dBu is the "overload" point. Or, IOW, what is the...
by Gold
Thu May 21, 2015 6:39 am
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

The noise spectrum of buzz and hum is very different from rumble, pops and ticks. I'd expect to easily hear improvements. A good record should have a noise floor of about -65dBu.
by Gold
Wed May 20, 2015 5:13 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

Looking good Wayne. This is something I've wanted for a long time. Seeing the measurements is enlightening. Pretty much confirms what I've suspected for a while. Reducing the hash that creeps into every setup will do far more to improve sound quality than another zero or two in the THD or noise floo...
by Gold
Wed May 06, 2015 9:41 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

From what I understand the laser turntables are not an unqualified success. I haven't used one but I've been told that they produce strange artifacts when they don't track properly. Worse than a good old cartridge.
by Gold
Mon Apr 27, 2015 2:27 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

Sounds like a winner!
by Gold
Sat Apr 25, 2015 10:45 am
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

I have been thinking about all the options and I keep seeing possibilities. Just like the MS board. If you want to use the preamp as reference playback it would be nice to have an insert jumper after the RIAA for EQ to flatten out cartridge response. This may be something very few people want but if...
by Gold
Fri Apr 24, 2015 4:52 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

Ahh, I didn't see those uses. Carry on.
by Gold
Fri Apr 24, 2015 12:48 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 455144

Re: Flat Phono Preamp Based on John's P10 and 2SK389

Looks great Wayne. The only comment i would make is that I don't see a need for a separate monitor out and record out. If you are doing transfers you always want to monitor through and after the recording device to make sure the transfer is okay. I would rather see a consumer style parallel output.
by Gold
Tue Apr 21, 2015 8:38 pm
Forum: Pro Audio Design
Topic: Tilt Equalizer
Replies: 35
Views: 66931

Re: Tilt Equalizer

I guess I'm confusing matters by using the word tilt. I visualize "tilt" as meaning a control where, for example, you increase the low end and there is a simultaneous decrease in the high end or vice-versa. That is a Tilt EQ. You use a tilt EQ to make very broad changes of the frequency s...