The AM Forum
March 29, 2024, 11:37:57 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: 6CW4 vs 6DS4  (Read 3716 times)
0 Members and 1 Guest are viewing this topic.
WA2SQQ
Contributing
Member
*
Offline Offline

Posts: 1090


« on: February 20, 2018, 05:52:17 PM »

Doing a small restoration project on a receiver that uses 2 6CW4s. One tests marginal. I have a new 6DS4 which I’m told is interchangeable. Anyone know the difference?
Logged
WD4DMZ
Member

Offline Offline

Posts: 150


« Reply #1 on: February 20, 2018, 06:12:25 PM »

According to this list the answer is yes:

http://www.nostalgickitscentral.com/info/tubexref6.html

Scroll down to the 6CW4.

Rich
Logged
w8khk
Member

Offline Offline

Posts: 1201


This ham got his ticket the old fashioned way.


WWW
« Reply #2 on: February 20, 2018, 06:34:17 PM »

According to the RCA receiving tube manual RC-24, the 6CW4 has slightly larger transconductance 9800 umhos compared to the 6DS4 with 9000 umhos.  The plate resistance of the former is slightly smaller, 6600 ohms, compared to the latter 7000 ohms.  Thus the characteristic curves are slightly dis-similar.   

The manual also states that the 6DS4 is used in circuits to reduce cross-modulation because of its cutoff characteristics.  All other ratings are identical, so it should work fine as a direct replacement for the 6CW4.
Logged

Rick / W8KHK  ex WB2HKX, WB4GNR
"Both politicians and diapers need to be changed often and for the same reason.”   Ronald Reagan

My smart?phone voicetext screws up homophones, but they are crystal clear from my 75 meter plate-modulated AM transmitter
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.043 seconds with 19 queries.