Larry, Ok, I never tried that. I never found any specs on the actual distortion running them that way.
Does not seem to make sense, as you have to run them like class B tubes I suppose, with special driver transformers and low impedance. Better to stay AB1 and run kt90's I would think. Brett N2DTS > > The way to make 6146's sound good as modulators is to run them in a > triode connection: control grids grounded; feed audio to the screens > w/screens @ DC ground. Takes more driving power, but the results are > well worth it. For plate supply over ~750V you may need to put a few > volts of negative bias on the control grids (still @ ground for audio, > tho.) > > 73, > -Larry/NE1S > > Brett Gazdzinski wrote: > > > > Steve, N2DXM had one of these about 20 years ago when > > we both got into AM. > > A nice transmitter, well made, but poor choice of modulator > > tubes, 6146's I think they were. > > I never got a pair of 6146 tubes to sound good as > > modulators, but I suspect some people have. > > A prime candidate to switch to KT88 or KT90 tubes in > > AB1. > > > > My top pick for a 100 watt transmitter is the 32v2 or 32v3. > > Robust iron, good stock sound, very stable pto, reliable > > operation. > > I have had 2 for 15 years now (sold the third for $200.00) > > and never had a single problem with any of them, despite > > using them a lot. > > I am using them for exciters now, to drive the homebrew rigs. > > > > I run mine on high voltage with solid state diodes in the low > > and high voltage power supplies, no problems at all. > > > > No grid tuning or drive levels to fool with, tune the vfo > > to frequency, dip and load the final, and yak.... > > > > There is not much that HAS to be done to the stock rig > > to make it sound very good, just a resistor change > > to match a d104 better... > > > > Ask anyone who has had a number of 100 watt rigs including > > the 32v3, and most likely they will tell you they like the 32v > > best. > > I have got rid of all the others, but kept the 32v's. > > > > The only Collins stuff I really like is the 30k-1, the 32v series, > > and maybe the kw1 (never had one of those). > > Did not like the kws1, kwm2a, 75a4, r388, etc. > > > > Brett > > N2DTS > > > > > > > > I just finished cleaning up the B&W 5100 I picked up > > > at the Butler meet last Summer. > > > > > > I don't know what prompted me to buy it , but now I am > > > sure glad I did. Maybe it was all the great food ( > > > including Russ's fabulous baked beans of mass > > > destruction HI!) > > > > > > What strikes me the most about this radio is how well > > > it is designed and constructed. My only complaint > > > about the design is that the mode switch intereferes > > > with access to one of the audio input shield screws - > > > boo hoo. > > > > > > Other than that, this is by far the best built radio I > > > own in terms of construction, ease of servicing and > > > overall engineering. Better than my Collins, > > > Halicrafters, WRL, Drake, Eldico etc. The only thing > > > that comes close is my TMC gear or the T-368 - but > > > these were obviously not for the amateur market. > > > > > > Modular construction allowed for easy replacement of a > > > few parts in the modulator. I essentially replaced > > > several .001 with some .02 and two out of spec > > > resistors. > > > > > > The use of an oil filled cap in the filter was a nice > > > change. Typically one has to take a small loan for > > > direct replacements or cobble up a string of > > > electrolytics with eq. resistors. In fact I only had > > > to replace three electrolytics - the double 20 @ 450v > > > and a 20 @150v. > > > > > > A wire brush was very useful cleaning up the milled > > > edges on the knobs. > > > > > > I plugged all the interconnects and applied power > > > through a variac. No problems at all in ramping up to > > > 120v. Soon I had 150w CW and 100 phone output. > > > > > > I am really impressed how well the B&W 5100 is built > > > and how easy it is to work on and put back on the > > > air. > > > > > > I'll lug it upstairs and put it on the air for the > > > DX-60 net tomorrow. > > > > > > So I ask you fellow buzzard ops, what is your favorite > > > "best built ham transmitter?" > > > > > > 73 DE KA4JVY > > > Mark > > > > > > > > > > > > __________________________________________________ > > > Do you Yahoo!? > > > Yahoo! Mail Plus Powerful. Affordable. Sign up now. > > > http://mailplus.yahoo.com > > > _______________________________________________ > > > AMRadio mailing list > > > [email protected] > > > http://mailman.qth.net/mailman/listinfo/amradio > > > > > > > _______________________________________________ > > AMRadio mailing list > > [email protected] > > http://mailman.qth.net/mailman/listinfo/amradio > --------------------------------------------- > Introducing NetZero Long Distance > 1st month Free! > Sign up today at: www.netzerolongdistance.com > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio
