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Phono Preamp Beta Testers [message #93481] Sun, 11 April 2021 05:13 Go to next message
smartt is currently offline  smartt
Messages: 59
Registered: March 2020
Baron
Were there any beta testers? Did they like the phono preamp?
Re: Phono Preamp Beta Testers [message #93488 is a reply to message #93481] Sun, 11 April 2021 11:58 Go to previous messageGo to next message
gofar99 is currently offline  gofar99
Messages: 1651
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hi, Yes. And they love it. Worse they don't want to return the prototypes and pre-production versions and are arranging to buy them. All are now spoken for. I have one and it is my main one in my system. Since I can have anything I want within reason I figure it makes a statement. Now if we can only get the suppliers and fabricators to go back to work things would be nice. As long as the virus hangs around it interferes with that.

Good Listening
Bruce
Re: Phono Preamp Beta Testers [message #93493 is a reply to message #93481] Sun, 11 April 2021 14:10 Go to previous messageGo to next message
smartt is currently offline  smartt
Messages: 59
Registered: March 2020
Baron
Speaking of virus, I received pfizer second dose on MAR 2 2020. We will defeat this virus. Find a name yet for phono? You ended your design with third generation on OCT 25 2020. From OCT 25 2020 to APR 10 2021, you had time to evaluate phono. Any more changes or options to consider?
Re: Phono Preamp Beta Testers [message #93498 is a reply to message #93493] Sun, 11 April 2021 21:07 Go to previous messageGo to next message
gofar99 is currently offline  gofar99
Messages: 1651
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hi, No firm name yet. The third pre-production ones only differ from the second with a slight change in transformer orientation and slightly smaller case. Otherwise the same. We may swap some of the ECC803s with 7025s. The jury is out on it. They are supposed to be quieter, but I have one hand built one with 803s and one version 2 with 7025s and I can't really tell much difference. Both test and measure the same within expected tube tolerances (about 1 db for S/N ...response is identical). The best 7025s were from EH and the worst were TAD. ECC803S were JJ standard pin (not gold pin...they were worse!). To me they both sound the same as well.

Good Listening
Bruce
Re: Phono Preamp Beta Testers [message #93602 is a reply to message #93498] Sat, 24 April 2021 14:43 Go to previous messageGo to next message
smartt is currently offline  smartt
Messages: 59
Registered: March 2020
Baron
For your phono, you have your own version of super regulator?

https://www.diyaudiostore.com/products/super-regulator
Re: Phono Preamp Beta Testers [message #93603 is a reply to message #93602] Sat, 24 April 2021 21:42 Go to previous message
gofar99 is currently offline  gofar99
Messages: 1651
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hi, that one seems to good only for low voltages. The preamp uses voltages in the 200-250 volt range. We do use a pair of LR8K4 regulators on the B+. No regulation is needed on the heater DC supply as the particular rectifiers we use drop just the right amount of voltage so it can feed the tube heaters.

Good Listening
Bruce
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