THE OLD DAYS and DOC KD4E

[Glen Zook]

The SB-200 uses 572B tubes, NOT 829B!

The 829B dates from World War II and was designed for
VHF operation.  It is a dual tetrode.  It has a plate
dissipation of up to 40 watts ICAS without forced air
cooling.  With forced air cooling that goes up to 45
watts.

The 572B is a triode that basically is equivalent to
two 811A tubes in the same envelope.

Glen, K9STH


--- RAY FRIESS <rayfrijr at msn.com> wrote:

Are you sure Glen?  An SB 200 uses a pair of 829B
tubes.  I've been told you can't put a pair of 811
tubes in there because the power supply is too much
for 811s.   On the other hand, a Collins 30L1 uses
four 811 tubes and many hams have put in two 829B
tubes in place of the four 811s and they report the
30L1 purrs like a kitten, hardly knowing the 829B
tubes are there.. and they last practically forever.









Glen, K9STH

Website:  http://k9sth.com


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