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I sent the spec sheets to Cayin. . .

104.28.85.161

In Reply to: RE: KT170. . . posted by Triode_Kingdom on November 29, 2024 at 08:05:28

for the 5R4GY and they said it is fine. So I assume, with their years of experience it hopefully is. I know they are fairly conservative, as a manufacturer should be.

I was watching the heaters on the GY come on and they were slower than the rest of the tubes, KT170 and 6SN7 types. I could put in my test sockets and measure but just don't feel like it at this time.

I do enjoy tubes. Used them as a radioman in the military and building my first tube receiver in high school in the latter 1960. Thank god my hearing is still really good so I can enjoy music etc. :^)

iBasso DX300MAX Ti. Focal Utopia and Stellia. iBasso SR2. Mr. Speakers, Ether II, Voce stats. Manley, Absolute headphone amp. LTA MZ3, Z10e electrostatic amp. Many other headphones, amps, cables etc.

Follow Ups:

RE: I sent the spec sheets to Cayin. . . - Triode_Kingdom 12:46:47 11/29/24 (4)
When were you a radioman? I got my first ham license when I was 14. By the time I was 16, I was copying Morse by ear at 60 WPM (much faster than I could write it down). All irrelevant now, of course.
- I was a code specialist but . . - John PA 15:07:13 11/29/24 (3)
  much slower than that. Spin, who had been a radioman for years, used a bug and could send and receive like talking, even look around. We used a typewriter of course but he was the fastest and cleanest I had ever seen.
  
  1968 to 72. Vietnam, sadly, a horrible war. Twice there. 69 and 71.
  
  iBasso DX300MAX Ti. Focal Utopia and Stellia. iBasso SR2. Mr. Speakers, Ether II, Voce stats. Manley, Absolute headphone amp. LTA MZ3, Z10e electrostatic amp. Many other headphones, amps, cables etc.
  - RE: I was a code specialist but . . - Triode_Kingdom 20:55:29 11/29/24 (2)
    When you say you used a typewriter, I assume you mean radioteletype (RTTY). Yes, it was a terrible war, and I was lucky not to have to go (almost - I turned 18 in 1970). I strongly disagreed with our involvement, but I also greatly resented how returning vets were sometimes treated. So much was wrong in so many directions back then. Anyway, good luck with your amp. Sounds like you have it under control now. :)
    - We had teletype but what I meant was that. . . - John PA 08:29:57 11/30/24 (1)
      I typed as I got messages, didn't write down by hand what I was receiving.
      Sometimes we couldn't get out by teletype and everything was encoded and I would be called upon to send out the messages. The other guys did about 6 words a minute. lol
      I sometimes got great skips of 1000s of miles. Once getting clear back to Long Beach, Calif. We once were caught in a huge storm and nothing could get out and I had to send out flash messages by code
      My brother who was 10 years older than me by coincidence was also a radioman in the Marines and knew code.
      
      iBasso DX300MAX Ti. Focal Utopia and Stellia. iBasso SR2. Mr. Speakers, Ether II, Voce stats. Manley, Absolute headphone amp. LTA MZ3, Z10e electrostatic amp. Many other headphones, amps, cables etc.
      
      Edits: 11/30/24
      - RE: We had teletype but what I meant was that. . . - Triode_Kingdom 09:53:20 11/30/24 (0)
        
        In Reply to: RE: We had teletype but what I meant was that. . . posted by John PA on November 30, 2024 at 08:29:57
        
        Got it - a typewriter! Man, I used to wish I could type! That was a real problem for me sometimes, but luckily most contacts on the air involve common words that are repeated from one conversation to the next. In fact, once speeds exceed 20 WPM or so, you switch from listening to the sound of individual characters to the sound of complete words or abbreviations. That really speeds things up.
        
        I was a ham for more than 50 years, with Morse and DIY being the main interest. I eventually abandoned it when I came back after a 10 year absence and discovered very few CW ops could keep up with me. I had put together a full break-in CW system running a kilowatt, so it was very disappointing. Then I found that the 80M novice band where I had cut my teeth decades earlier had been moved to make way for more phone privileges, and that the bands were full of no-code licensees. That was the last straw. :)
        
        I've been involved in audio since the early '70s, and leaving ham radio coincided with revisiting tubes. My first transmitter was a DIY job using a 1625, so it was a natural transition to the hobby here.
        
        It's interesting that you and your brother were both code guys. I joined the MARS program at one time, but it was cut short when I started college. I still remember listening to some of the messages from Vietnam.

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