Digital Drive

Hmm, got an 807 amp I built years ago, ran it 24/7 for 3 years, there ARE different ways to build_nT

166.216.159.201

Cleantimestream

In Reply to: RE: There is NO MAGIC here posted by Feanor on February 16, 2024 at 05:02:26

!
The Mind has No Firewall~ U.S. Army War College.

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There are different ways to manipulate the sound - Feanor 04:20:41 02/17/24 (0)
... If that's what you want to do. Personally I'd rather heard the inherent sound of the recording without modification -- this is what ultra-low distortion reproduction does for your.

Dmitri Shostakovich
Bags of 807's by the pound everywhere.... - AbeCollins 12:14:25 02/16/24 (1)
As a kid I would frequent a local electronics surplus store where they had several huge hot-tub sized wooden crates full of vacuum tubes. One crate was filled with 807 and some other large octal types. They also had shelves full of surplus AN/ARC-5 HF aircraft transmitters that also used 807 tubes. Those tubes were everywhere and they were popular among DIY Ham Radio operators going back to WWII.
As a Ham Radio operator I had a homemade HF [3 - 30 MHz] transmitter that my uncle built. It was my first transmitter after getting my Ham Radio license as a Jr. High School kid in the 1970's. It used two 807 tubes in the power amplifier final RF output stage. I used that transmitter for CW [Morse Code] operation and made contact with Hams all over the world including Europe, South America, Japan, Australia, various islands in the Pacific, and Palmer Station Antarctica. I had that transmitter for over 2 years and used it daily without a hiccup never having to replace any of the tubes. That transmitter was replaced with a commercial radio transceiver that used TV horizontal sweep tubes (6LQ6) in the RF output stage. Those weren't nearly as rugged but were OK for relatively low duty cycle use [CW and SSB].
I've seen a couple audio power amps based on the 807 output tube but never heard one.
- The 807, a Vacuum Tube for the Ages - IEEE Spectrum (Open in New Window)
Edits: 02/16/24 02/16/24
- RE: Bags of 807's by the pound everywhere.... - Cleantimestream 12:35:44 02/16/24 (0)
  Some said the 807 was the tube that won the War. Triode wired at 400 volts yielding 12 watts. Stripped down Williamson circuit. High primary impedance of 12K, only my push/pull 45 sounds better. We are not counting single ended (smile) they
  ARE, tough as Army boots.
  The Mind has No Firewall~ U.S. Army War College.

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