Re: [Drakelist] L4-B Question

2010-08-24 Thread Jim Shorney
On Tue, 24 Aug 2010 23:01:05 -0400, K9sqg wrote: >Too, I'm assuming you are using a reasonably accurate power meter. Remember also that absolute power measurements, especially across different bands, should be made into a dummy load. Measurements on an antenna system will be affected by reactanc

Re: [Drakelist] L4-B Question

2010-08-24 Thread K9sqg
Peter and others, I don't typically run my Drake linears on 110 volts so my experiences there are limited. However, I can still afford a comment or two which may or may not be useful. Typically, a decent set of tubes with properly operating power supply will provide about 900-1,000 watts DC

[Drakelist] L4-B Question

2010-08-24 Thread w2cdo
My L4-B puts out around 800 watts on 40 (120v) but only 600 on 20. Both antennas are fed identically and matching is the same. It puts out 500 on 15. Does this suggest that I should replace components (I'm sure the resistors are candidates) or is this just the nature of the beast? Thanks in adv

Re: [Drakelist] R4C unstable VFO

2010-08-24 Thread Joe Pyles
I bought a TR-4CW/RIT off ebay and it would jump in frequency even when just listening. I found that one of those dumbell ceramic capacitors inside the PTO had a very small crack in it. I replaced the cap and all is well. 73, Joe Pyles KC9LAD. At 05:19 PM 8/19/2010, you wrote: Hi People,

[Drakelist] L4/L4B HV Power Supply (L4PS) For Sale

2010-08-24 Thread GALE STEWARD
Awhile back someone was looking for the L4PS HV power supply for the L4/L4B... Here's a link to one on Ebay. FYI, this is NOT my auction or anyone I know. Strictly a "public service". http://cgi.ebay.com/DRAKE-L-4-AMPLIFIER-TRANSFORMER-/270624877049?pt=LH_DefaultDomain_0 73, Stew K3ND -

Re: [Drakelist] unstable R4C PTO

2010-08-24 Thread David Assaf
If you are not turning the dial and it jumps then it is not likely a mechanical issue. As stated before the vfo oscillator is quite voltage sensitive. My bet is the Zener as I have written earlier. Solid state devices were not consistently uniform as they are now and with use can get into

Re: [Drakelist] unstable R4C PTO

2010-08-24 Thread steve white
Dennis I had this problem once in a old HQ170 and it turned out to be the C in the vfo LC circuit. It was a nice looking mica capacitor and I didn't think at first that it could be the problem but after all the other things I changed once I replaced it all was right with the world again. S