Dennis Had Inspire Amps

[straitwire]

Pictures from earlier today...

...Both channels with face plates and transformer logos...
[IMG][/IMG]
[IMG][/IMG]

[decooney]

Originally Posted by Musica Amantem

just by joining both output speaker wires you get the mono-block result! Don't need to sell what I have (and love) while doubling the power ...

Originally Posted by decooney

In doing so, is it truly the same physical and audible result without any form of added degradation (as compared to purpose built mono block amps) is my question. For one, I'm adding "Y" splitters for interconnects, and doubling up speaker wires or jumpers, what else is not the same that might impact the sound in some way vs. true mono blocks?, etc.

Originally Posted by Musica Amantem

I had the same doubts, but as I remember, Dennis was emphatic stating preamp splitters and joining the amps' output speaker cables would do the trick. I hope I understood that right? And what would be the difference with a "bridging" approach?

If I/we can achieve the same result running two KT150 Hot Rod stereo amps (3 transformers on each unit!) and have it sound as good [or better] than dedicated mono blocks, I'd consider selling some other gear and buying a 2nd Hot Rod. Not trying to split hairs, but kinda want these to be my last amps for a while If you or others can confirm this with real testing and listening comparisons (or with Dennis), I'd really appreciate the answer. Thx.

...

[Formerly YB-2]

Originally Posted by BearCityUSA

I understand there will be a full list done up an a few days but initial word is 5-15 Watts pure class A triode SET.

Had a pair of Dennis' CAD-572SE SET monobloc's that made 20wpc. Would still have if the 572 power tube lasted longer than 1000hr. At $200/ea, got a bit expensive.

[straitwire]

Dennis just got in a bunch of 27's and 56's so he wants me to build an LP-27...

...stuffed, with 4 pin rectifier...
[IMG][/IMG]

...A/C, ground...
[IMG][/IMG]

...B+, cathode, signal path,...
[IMG][/IMG]

...filament...
[IMG][/IMG]

...selector switch, output...
[IMG][/IMG]

[Rosco65]

Originally Posted by decooney

If I/we can achieve the same result running two KT150 Hot Rod stereo amps (3 transformers on each unit!) and have it sound as good [or better] than dedicated mono blocks, I'd consider selling some other gear and buying a 2nd Hot Rod. Not trying to split hairs, but kinda want these to be my last amps for a while If you or others can confirm this with real testing and listening comparisons (or with Dennis), I'd really appreciate the answer. Thx.

...

A similar thought occurred to me. The Hot Rod amp uses a single driver tube, using each half to drove one output tube. The PSE is similar in arrangement but each driver tube half drives two output tubes uses a single output transformers for both output tubes. The mono blocks now have two driver tubes. Are the tube halves paralleled or does each half drive its own output tube, like the Hot Rod?

[FloridaBoy]

Originally Posted by decooney

If I/we can achieve the same result running two KT150 Hot Rod stereo amps (3 transformers on each unit!) and have it sound as good [or better] than dedicated mono blocks, I'd consider selling some other gear and buying a 2nd Hot Rod. Not trying to split hairs, but kinda want these to be my last amps for a while If you or others can confirm this with real testing and listening comparisons (or with Dennis), I'd really appreciate the answer. Thx....

Contact Dennis through the auction site and get it straight from him.

[BearCityUSA]

Originally Posted by Rosco65

A similar thought occurred to me. The Hot Rod amp uses a single driver tube, using each half to drove one output tube. The PSE is similar in arrangement but each driver tube half drives two output tubes uses a single output transformers for both output tubes. The mono blocks now have two driver tubes. Are the tube halves paralleled or does each half drive its own output tube, like the Hot Rod?

Dennis’ reply to your query:

The dual section (dual-triode) 6SL7 driver tube in the new Inspire monos is a Anode current source circuit. The top section providing the infinite impedance current and voltage to the lower gain stage. Different from the stereo version.

[decooney]

Chatted with Dennis some today over msg about pairing of inputs and outputs of two stereo amps for more power and the results of dong so:

response:
"Keep mind we are speaking about single-ended amplifiers. Simply pairing inputs and outputs of SE amps will yield a double of power into half the single channel impedance. 2x power at 4ohms. An 8 ohm stereo output in a strapped mono will have twice the power into a 4ohm load because of the two output transformers in parallel.". He then goes on to needing a "balanced input source...balanced preamplifier to effectively bridge a SE stereo amplifier". As for sound, answered with this: "to my ears bridging does not sound the same as the basic stereo amp, with inferior sound in a bridged configuration", "not to be confused with parallel channel mono".

re: wattage
I forgot to ask about WATTAGE of the MONO amps with KT150 tubes. 12 o 17wpc? Is MONO power different somehow, maybe more grunt with bigger transformers, who knows...

[FloridaBoy]

re: wattage
I forgot to ask about WATTAGE of the MONO amps with KT150 tubes. 12 o 17wpc? Is MONO power different somehow, maybe more grunt with bigger transformers, who knows...

From your posts it appears that your speakers need some power to give you what you are looking for. Discuss this with Dennis.

[Rosco65]

Originally Posted by FloridaBoy

re: wattage
I forgot to ask about WATTAGE of the MONO amps with KT150 tubes. 12 o 17wpc? Is MONO power different somehow, maybe more grunt with bigger transformers, who knows...

From your posts it appears that your speakers need some power to give you what you are looking for. Discuss this with Dennis.

Are the mono’s triode wired? I would have expected the output to be similar to the stereo PSE. Mine puts out about 24wpc with KT88’s, but mine is not triode-connected.