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February 22, 2018, 07:44:04 PM *
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 on: February 20, 2018, 06:34:17 PM 
Started by WA2SQQ - Last post by w8khk
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.

 on: February 20, 2018, 06:12:25 PM 
Started by WA2SQQ - Last post by WD4DMZ
According to this list the answer is yes:


Scroll down to the 6CW4.


 on: February 20, 2018, 05:52:17 PM 
Started by WA2SQQ - Last post by WA2SQQ
Doing a small restoration project on a receiver that uses 2 6CW4s. One tests marginal. I have a new 6DS4 which Iím told is interchangeable. Anyone know the difference?

 on: February 20, 2018, 04:30:55 PM 
Started by WA1HZK - Last post by WA1HZK
I'm not afaid to build something stupid. I probably have an ART-13 Mod transformer around here somewhere!
That would be fun. Bring back some Frankin-Rigs!

 on: February 20, 2018, 04:25:03 PM 
Started by no3m - Last post by nq5t
Starting on page 58 of the 1949 (12th edition) of the radio handbook, (entire volume downloadable from AmericanRadioHistory site at the following link:) 


You will find an all-band 15 watt exciter using the Collins PTO using the 2E26 as the output stage.

I recall something nearly identical to this changing hands on eBay during the last couple of years.  It had the look of some sort of Collins prototype, but was clearly home brew and very well built.

 on: February 20, 2018, 03:47:58 PM 
Started by WA1HZK - Last post by KB2WIG

813??  Yeah that would work....  BUT     Stuff an 810 in there and get 2 X the POWA out... youl be swinging the monkey and shakin the bacon!


Hmmmm  I've got a few 8000s in stock.

 on: February 20, 2018, 03:44:27 PM 
Started by WA1HZK - Last post by WA1HZK
We have the technology. We can upgrade him. Increase his power. Make him glow in the dark.
In short, give him the blue pill of added electrons!

 on: February 20, 2018, 03:33:41 PM 
Started by WA1HZK - Last post by WD8BIL
813..... Hmmmm...... how well does that work at 710VDC B+ ..... 300VDC Screen?

 on: February 20, 2018, 02:38:28 PM 
Started by WA1HZK - Last post by WA1HZK
That's another good idea for any 100 watt class tube AM transmitter.
Hmmmmm, My Viking one doesn't have a cabinet anyway. I wonder how it would look with a 813 final?
Kinda pissa I bet.

 on: February 20, 2018, 02:10:18 PM 
Started by WA1HZK - Last post by WD8BIL
Here's another mod that worked out quit well Keith.


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