Dennis Had Inspire Amps

[Breakdown7]

Thanks for the info Scott. I really do appreciate it. I'll send a pic to Dennis. I did buy the PSE second hand, but have bought Dennis' gear before directly from him and can contact him. I just don't like to bother him usually. My PSE amp was completed 9-23-16. The seller was not familiar with whether or not the amp had the IIRPS.

[BearCityUSA]

Originally Posted by Breakdown7

Thanks for the info Scott. I really do appreciate it. I'll send a pic to Dennis. I did buy the PSE second hand, but have bought Dennis' gear before directly from him and can contact him. I just don't like to bother him usually. My PSE amp was completed 9-23-16. The seller was not familiar with whether or not the amp had the IIRPS.

Mine is three days newer, 9-26-16. Let me know what DH says. I am curious how good my memory is. A simple test as I get older.

BTW, when I go my first Inspire pieces, which were second hand, Dennis treated me like family from day one. Might be why I got two more from him. Good business.

[Breakdown7]

I'll contact him and report back. Yes he is so gracious and nice to deal with. If I fall in love with this PSE, I'm gonna have him build me one in the copper color, to match my LP-27a preamp. My amp is "harley black". I like the color and classic look, but ultimately I love that copper finish on my preamp the most.

[Breakdown7]

Dennis responded back already. That was fast! He says my amp is indeed one of the new models with the IIRPS. He also says he prefers the 5R4 rectifier in the PSE's. So that is great news! I was hoping for the new power supply design.

[Analog Addict]

Originally Posted by BearCityUSA

About the time Dennis started making PSE he also came up with the IIRPS (see recent sales on eBay). I seem to recall a few were sold before mine and mine was the first with the new PS circuit. With the IIRPS, typically the rectification is provided with diodes and the rectifier tube is a PS feedback buffer. With the IIRPS DH uses direct heated rectifiers (5y3, 5r4). A lower noise floor I was told. It will not hurt to run indirect heated rectifiers (5ar4) in the new PS but sound may be compromised.

I think I recall you bought your PSE on second hand market. If seller cannot tell you weather you got the IIRPS or not, pull the bottom cover off and send DH a picture. I know he can tell with a quick look. Maybe even easier, I can check the date on mine and if yours is a newer vintage you should know.

Scott

Scott,

I've not heard it described as a feed back buffer before. My understanding is that the IIPS circuit is used as a voltage lock/regulator on the screen grid of the beam tetrode. Apparently even small variations in voltage can cause noticeable distortion and muddying of the signal. But, if the idea is to buffer the screen grid voltage against any variations produced by the upstream power supply, that description makes sense.

[BearCityUSA]

Originally Posted by Analog Addict

Scott,



I've not heard it described as a feed back buffer before. My understanding is that the IIPS circuit is used as a voltage lock/regulator on the screen grid of the beam tetrode. Apparently even small variations in voltage can cause noticeable distortion and muddying of the signal. But, if the idea is to buffer the screen grid voltage against any variations produced by the upstream power supply, that description makes sense.

Allen,
Your understanding of SE amp circuitry far supersedes mine. My terminology (feedback) was not meant to imply signal feedback so was likely the wrong term. Anyway, it is how I seem to be able to get my mind around it. Thanks for the clarification.

[pstrisik]

My oversimplified understanding is that the tube use in this part of the power line provides an interruption via the gap that electrons jump, leaving behind what Dennis has called "parasitic nasties".

Not unlike my use of T-Link Media Converters, one at my router, one at my streamer/bridge with fiber in between. Leaves the nasties behind. I'm seeing increasing mention of "galvanic isolation" at ethernet ports, usb, virtually all of the signal connection types, for the same purpose.

[Rosco65]

Originally Posted by Analog Addict

Scott,

I've not heard it described as a feed back buffer before. My understanding is that the IIPS circuit is used as a voltage lock/regulator on the screen grid of the beam tetrode. Apparently even small variations in voltage can cause noticeable distortion and muddying of the signal. But, if the idea is to buffer the screen grid voltage against any variations produced by the upstream power supply, that description makes sense.

IIRC, the rectifier tube serves two functions: it acts as a regulator replacing a zener string feeding the grid supply, and serves as a voltage buffer between the B+ and grid supplies. The vacuum in the tube isolates (to a degree) variations in B+ voltage (such as during peaks) from affecting the regulated grid voltage. Dennis has asserted that a stable grid voltage is essential to avoiding parasitic distortion.

[straitwire]

Finished this FireBottle SE the other day, Dennis is listening to it with KT-150's
[IMG][/IMG]
Finished this PSE with glo-tube regulation this morning
[IMG][/IMG]
Couldn't resist lighting it up with some of my tubes!
[IMG][/IMG]

[nhparrot]

Originally Posted by straitwire

Finished this FireBottle SE the other day, Dennis is listening to it with KT-150's
[IMG][/IMG]
Finished this PSE with glo-tube regulation this morning
[IMG][/IMG]
Couldn't resist lighting it up with some of my tubes!
[IMG][/IMG]

What is the tube layout and purpose of "glo-tube regulation"?