[BC] unreliable old equipment query

[Milton Holladay]

Quibble: WIS Radio (now WVOC, at least until Jan. 3) built a new site in 
1966 and installed a BTA-5T. It still sits in its pink and umber gray 
glory in aux service to the gates 5; the "new" is barely worn off.  
(WVOC is 5kw day and 5kW dir night.)
Over the years, it got good tube life and even ran AM stereo for a time, 
with few troubles and with very stable operation. (They would never 
touch the third harmonic resonator even though they weren't getting 
quite the 90% PA efficiency claimed for it..)
As for those tuning variables, that sounds normal to me, except the 
"keeping" part.
As for the undersized business, AFAIK the 5T is the same as the 5U in 
less cabinet, the 5U being discussed here a week or two ago in regard to 
supermodulation at WEAM.
M

On 12/27/2011 21:22: VIRUS ALERT!, Xen Scott wrote:

[snippage]
An example from my experience is the RCA BTA-5T 5kw AM transmitter. The 
design of the final amplifier stage required that several tuning 
variables be kept in precise adjustment or the life of the final 
amplifier tube would be cut drastically short and failure would result. 
Other components in this transmitter were also undersized so that 
certain kinds of audio would cause the transmitter to overload and shut 
down.
[snippage]

-- 
Milton R. Holladay Jr. / miltron at att.net
Columbia, S. C. / 803-331-8059
RF Masurements / Planning&  Installation / Emergency Service&  Parts