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Analog Addict 01-31-2023 09:46 AM


2bornot2bop 02-04-2023 10:59 PM

A good hello to all forum members!

I’m back into the Dennis Had fold again, having recently acquired an LP 3.1 preamplifier. It’s an upgrade from my former LP2.

2bornot2bop 02-05-2023 12:02 AM

So I’ve been away from the Inspire fold for 6 years.

Is there anything new? :)

2bornot2bop 02-05-2023 12:10 AM


Originally Posted by cporada (Post 1071152)
Hi Glenn,
Thanks for your message. I am now almost certain the issue lies with the LP-2 based on the following diagnoses I have run through:

If I flip the input switch on the Decware Torii to the other inputs (to which nothing is connected), there is no hum, even if I turn the volume pot all the way up, so it seems to be somehow related to an interaction between the LP-2 and the Torii.

If I switch the preamp to the other set of inputs on the Torii, the hum follows the preamp - now the other input on the Torii (with nothing attached) is silent.

The hum persists irrespective of which set of inputs or outputs I use on the LP-2 (I only have one source – my Mojo Audio DAC).

I disconnected all power cords and interconnects and reattached them to see if there was a loose connection somewhere, but the hum persists.

If it helps at all, this hum started after I installed my new Sophia Princess 274b meshplate rectifier in the LP-2, but it only began after listening for about 2 hours.

Swapping out the 274b for the original 5Y3GT does not solve the problem. I have also tried swapping out all 3 6FM7 tubes to no avail.

The system is on a dedicated 20A circuit, and all gear is plugged into a Puritan PSM156 line conditioner that is grounded to a Puritan GroundMaster City. If it helps in diagnosis, the Puritan also filters any DC that might, for some reason, be on the line.

This is most frustrating, as it occurred with no warning, and I can’t figure out what is causing it or how to make it stop.

If I take the LP-2 out of the loop and just listen to my DAC directly into the Torii, the system is dead silent, so I have to conclude that the issue is with the LP-2.

Any thoughts/suggestions would be greatly appreciated.

Thanks again,

Hi Chris,

Sorry to hear about your problems. I ran the LP-2 with that identical rectifier and there was nary a problem with it. I’ve since sold it a couple years ago. I hope you find what the problem is, and soon!

2bornot2bop 02-05-2023 12:13 AM


Originally Posted by Analog Addict (Post 1070962)
Dennis was working on this all afternoon, and when I left the shop he said he was staying until it was finished. Well he finished it. Said it's the best amp he's ever heard, period. Mighty strong language there. What does that tell you? by analog addict, on Flickr by analog addict, on Flickr by analog addict, on Flickr by analog addict, on Flickr

Check out the distortion curve. Second order distortion is down -45db. Third order distortion? What third order distortion? by analog addict, on Flickr

If I had the coin jingling in my pocket, I'd buy one...

Darn, and I just missed Santa’s wish list!

Absolutely beautiful amplifier, and tubes!!!

2bornot2bop 02-05-2023 01:18 AM

Hoping to find a "FB" KT88 to mate with a LP 3.1 preamplifier. Seeking to drive a pair of OB's.

The custom wood is Maple with a Mahogany center stripe. The Baffles were produced by a local skilled woodworker. 15" driver and 15" Augie Sub.

Showme 02-05-2023 11:09 AM

Nice looking speakers. Looks like you have a good builder too.

2bornot2bop 02-05-2023 11:56 AM


Originally Posted by Showme (Post 1071599)
Nice looking speakers. Looks like you have a good builder too.

Thank you. Yes, he was one of a kind!

Analog Addict 02-05-2023 02:43 PM


Originally Posted by 2bornot2bop (Post 1071594)
Hoping to find a "FB" KT88 to mate with a LP 3.1 preamplifier.

You want a Fire Bottle KT-88? Send me a PM with your PayPal address, Dennis will send you an invoice, and presto!

You get a Fire Bottle KT-88....

Showme 02-05-2023 03:01 PM

I like to keep a backup set of tubes for all my gear. I'd welcome suggestions to watch for to buy for my LP-2030.

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