Dennis Had Inspire Amps

[CoGT3]

Will be a couple of days before I'll get a good listen. Work/new baby keeping me busy.

This PSE is like the rest with the IIPS. Dennis suggested I try the kt66 to start with. Thought it would more in the vain the 45 set I've been listening to. Agree, will definitely try kt77 also.

Regarding the copper chassis. My 45 set is copper also. I asked Dennis early on about doing a copper chassis, I paid a surcharge to have this done around the cost of a set of output tubes.

[BearCityUSA]

Originally Posted by BearCityUSA

I've been going back over this thread and ran across reference to the 6GB6GA, also similar to a 6L6. They are roughly the same price as the 807's. It just so happens that I have enough credit on my paypal acct burning a hole in my tablet. Any recommendations as to one vs the other from my friends here? I am figuring to get a quad for my PSE.

While browsing I ran across some 70's & 80's vintage Soviet r-807 which, at first glance, seems compatible with western 807s. Anyone tried them? I have had pretty good luck with late Soviet era tubes and figure why not try again. They do seem a bargain.

[Formerly YB-2]

The Soviet era tubes were generally very well made. Their military relied on tubes as the USSR never managed to develop a solid-state manufacturing capability to support their needs. Even their latest MIG fighters, which were very capable, had tube-based electronics.

[Analog Addict]

Originally Posted by Formerly YB-2

The Soviet era tubes were generally very well made. Their military relied on tubes as the USSR never managed to develop a solid-state manufacturing capability to support their needs. Even their latest MIG fighters, which were very capable, had tube-based electronics.

I thought the reason the Russians still use a lot of tube based electronics is that they are EMP resistant....

[BearCityUSA]

Allan,

I think you know the answer to this. I have been rereading this thread lately and ran across posts which I think are incorrect. Namely that the Inspire Firebottle amps are UL. I understand them to be SEP. I even seem to recall Dennis expressing his dissatisfaction with UL circuits which I feel I concur. However if these Inspire amps are UL then I will have to rethink my life a bit.

Scott

[Bombadil]

Originally Posted by Formerly YB-2

The Soviet era tubes were generally very well made. Their military relied on tubes as the USSR never managed to develop a solid-state manufacturing capability to support their needs. Even their latest MIG fighters, which were very capable, had tube-based electronics.

I like many of the Russian/Soviet tubes. Including many of their current production tubes, such as most of the Genalex labeled tubes.

It is true that Soviet military planes used tubes, but the last one built with tubes rolled off the production line in 1984. A few of them are still in service, in limited duty. Tubes built for these planes were very rugged & reliable.

[Bombadil]

Here's a nice little article about the Soviet 6C33C-B tube

http://blog.thetubestore.com/emp-its...-6c33c-b-tube/

[x3workshop]

Great article. Thanks!

[Analog Addict]

Originally Posted by BearCityUSA

Allan,

I think you know the answer to this. I have been rereading this thread lately and ran across posts which I think are incorrect. Namely that the Inspire Firebottle amps are UL. I understand them to be SEP. I even seem to recall Dennis expressing his dissatisfaction with UL circuits which I feel I concur. However if these Inspire amps are UL then I will have to rethink my life a bit.

Scott

Scott,

I have been repairing an amp on a consignment repair job that apparently was a knock off of an earlier design, and it is UL. However, Dennis absolutely hates UL designs now, describing them as the worst sort of "degenerative feedback". I found it to be a good exercise for me since this is an entirely new circuit for me, and I learned a lot from playing with it and modifying the design...Oh and it's easy enough to tell if an amp is UL. If the OPT has a third wire from the primary side that goes to the screen of a beam power tetrode or pentode output tube, it's typically an UL design....

[FloridaBoy]

Originally Posted by Analog Addict

I thought the reason the Russians still use a lot of tube based electronics is that they are EMP resistant....

That's correct. MIG aircraft are all tubes.