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  #3881  
Old 06-22-2017, 11:40 PM
Bombadil Bombadil is online now
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Originally Posted by zip View Post
I only see a few comments on the Hot Rod versions. Is
Does the term "Hot Rod" actually mean anything anymore? I believe a Hot Rod KT88 amp produces 12 wpc. My non-Hot Rod KT88 produces 17 wpc.
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  #3882  
Old 06-23-2017, 03:10 AM
FloridaBoy FloridaBoy is online now
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Originally Posted by BearCityUSA View Post
Give me a few days to put something together. Getting ready for vacation next week so pretty busy wrangling up stuff for the trip. The visit was eventful. I'm still getting my mind around it all. As I have said before, make the trip if you can. In the mean time I will attempt to be a surrogate.
Oh yeah, we want the story...but it can wait until you return from vacation.
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  #3883  
Old 06-23-2017, 08:44 AM
Musica Amantem Musica Amantem is online now
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Originally Posted by Analog Addict View Post
If you don't get back to RTP by Sept, I will be in Asheville for a conference 9/8-9 10, and would be happy to bring my PSE 45 along for a demo. I'm hoping my PSE 71-A will also be ready by then....
I was curious about your interest in the 71-A output tube for your PSE project, so I did some research:

The type 71A vacuum tube was a power amplifier triode intended for use in the final audio stage of battery- or alternating current-operated receivers. It began life, under the old style of tube designation, as the UX-171 and was announced by the Radio Corporation of America (RCA) in May 1926. Operated at its published conditions, it was able to supply nearly 800 milliwatts of audio power, a reasonable amount for a single tube. It was superseded in November 1926 by the improved UX-171A, which featured a lower filament current.

"The UX-171 and 171A were first issued with the “globe” style bulb, similar in appearance to an old-style light bulb. In the early 1930s, the bulb was changed to the “ST” shape (also known as the “coke-bottle” shape), and given the new designation of 71A.

Radio engineers used it extensively in broadcast band radio receiver designs. The 71A provided more audio power than the UX-112A, and the tube was less expensive than the UX-210 or UX-250 tubes. The 71A's only real competition, for design purposes, was the UX-245 power triode.

Today, the 71A has a small following amongst high-end amplifier builders and hobbyists. It was a high-production tube and is relatively easy to find from various tube suppliers (and on eBay)".


What differences do you expect relative to the gorgeous PSE 45? Thanks for your inputs.

Edit: Excuse my old memory, because now I think I may have poised this same question in the past?

Last edited by Musica Amantem; 06-23-2017 at 07:59 PM.
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