Dennis Had Inspire Amps

[Musica Amantem]

Originally Posted by Analog Addict

The way my amp is wired is that the two 45 output tubes are just both fed off a split signal from the driver tube (6SN7) and then feed into the same tap of the OPT. Triode wired all the way, just in parallel....

Excellent. I guess that may yield about 4 Watts of glorious output power? Maybe you just answered my original question, but just to be clear, is it possible to design a PSE with beam-Tetrodes strapped as Triodes, in parallel? I believe this would be the ideal compromise between mid-range glory and reserve power, the latter being ideal to enjoy demanding classical orchestral music featuring many instruments. Thanks for your insights.

[Rosco65]

Originally Posted by Analog Addict

The way my amp is wired is that the two 45 output tubes are just both fed off a split signal from the driver tube (6SN7) and then feed into the same tap of the OPT. Triode wired all the way, just in parallel....

This is interesting but makes me wonder how different it is from a SE 6B4G or dual plate 2A3 amp? The dual plate 2A3 is two 45's in the same bottle, while a 6B4G is a 6.3V Octal version.

[Analog Addict]

Originally Posted by Rosco65

This is interesting but makes me wonder how different it is from a SE 6B4G or dual plate 2A3 amp? The dual plate 2A3 is two 45's in the same bottle, while a 6B4G is a 6.3V Octal version.

That question was asked in that other audio forum, and Dennis told me that it was that you're still retaining the sound of the 45 tube, while a 2A3 amp, despite being two 45's in the same bottle, sounds different. I also have a 2A3 amp, and it's just not as sweet as a 45 amp or the PSE 45 amp. Kinda makes me wonder what a PSE 71-A amp would sound like?...

[Rosco65]

Originally Posted by Analog Addict

That question was asked in that other audio forum, and Dennis told me that it was that you're still retaining the sound of the 45 tube, while a 2A3 amp, despite being two 45's in the same bottle, sounds different. I also have a 2A3 amp, and it's just not as sweet as a 45 amp or the PSE 45 amp. Kinda makes me wonder what a PSE 71-A amp would sound like?...

Now I wish I knew what that other forum was...

[CoGT3]

Originally Posted by straitwire

I have the output transformers on it now, should be finished with it Monday.





This one's mine, I'm running Golden Voice 6CA7's (thanks Dennis), Psvane CV181, RCA 5Y3, and JAN 0A3's

Beautiful stuff Straitwire, thats a lot of light bulbs in that amp.

Originally Posted by Analog Addict

I believe they are for PSE variants using the VR tubes as well. Wave some Benjamins at him and see if he'll build a PSE 45.......

The electronic waving of Benjamins has commenced, we will see if he takes the bait.

[straitwire]

Thanks CoGT3 I'm almost done!...



I'll stuff this one today and start prewiring



The output tube socket holes are oversized to accommodate 4 and 5 pin ceramic tube sockets and 8 pin tube sockets still work too...

[Rosco65]

Originally Posted by Analog Addict

That question was asked in that other audio forum, and Dennis told me that it was that you're still retaining the sound of the 45 tube, while a 2A3 amp, despite being two 45's in the same bottle, sounds different. I also have a 2A3 amp, and it's just not as sweet as a 45 amp or the PSE 45 amp. Kinda makes me wonder what a PSE 71-A amp would sound like?...

I've never heard a PSE 45 amp but had a direct-couple 45 amp (Rankin Bugle circuit) about 20 years ago. I loved that amp into a pair of DIY 94 dB Cabasse two-ways, though they did run out of steam a little early with only 1.5 watts.

One of my current amps is a 421A SET. The 421A/5998 is a IDHT that is essentially two tubes in one bottle. I use a single tube powering both channels putting out about 4-4.5 wpc. electrically it is a bit like a 2A3 but sounds much closer to a 45 in character.

This is a 6SL7 > 421A amp that is really easy to drive (0.5v for full power), is super quiet and has great bass with Hashimoto output transformers. I would really like to hear it in a head-to-head with a PSE 45 amp. Unfortunately, PSE 45's are as rare as hen's teeth.

That being said, I wouldn't recommend designing around the 421A. It is no longer in production and the headphone gys have driven up the price of tubes. However, with only three tubes per amp (5Y4GT, 6SL7GT, 5998/421A) the total tube cost is less than some rectifier tubes.

[Analog Addict]

Originally Posted by Rosco65

Now I wish I knew what that other forum was...

Starts with an A and ends with a K. If you really want to know about the PSE 45 build, go to their Tube Forum and search the title "Repurposing old parts into a Parallel Single Ended 45 Amp". I know that posting links to other forums is not permitted. Hopefully these clues are allowable. If not, sorry in advance...

[jdandy]

Analog Addict.......For you information, mentioning the name of another forum is not against this forum's rules. The rule says you may not post active links to other forums. Hope this clarification helps.

[Analog Addict]

Originally Posted by jdandy

Analog Addict.......For you information, mentioning the name of another forum is not against this forum's rules. The rule says you may not post active links to other forums. Hope this clarification helps.

Thanks. I'm just trying to walk the thin line. The aforementioned thread is in Audio Karma's Tube forum....