Barrie, Download a copy of the manual, TM 11-286.
This can be gotten from: http://eshop1.chem.buffalo.edu/Beastly-610.html This is WB2FCNs web site. The area you want to look at in the TM starts around page 43. In the Military versions of the HT-4, (BC-610s), there are what looks like HV fuse clips on the top of the final loading cap. Depending which loading coil is used, either C-455 or C-454, dictates whether you use a 55uuf or a 100 uuf vacuum capacitor. If I had spares, I'd hook up with you and we'd talk. Unfortunately I do NOT. There are OTHER changes that MUST be made to the TX - OR - damage can occur. These are some MINOR rewiring that are COMPLETELY reversible! If you own and use a BC-939 tuner, it ALSO must have some rewiring done, and use of another one or two vacuum caps are used. With the BC-939, the "long wire" specified for operations from 1Mc to 2 Mc is 125 ft. As to the HT-5 speech amplifier, I strongly suspect that a BC-614 speech amp CAN be used in lieu of the HT-5. Watch that "E" place for them to turn up. They do from time to time. The other place to go would be the T-368 BC-610 mail list through QTH.NET. Join the list and meet some other owners of the BEASTS! Bob - N0DGN > With all this interesting discussion about the BC-610 I'm reminded of a > question I asked a while ago regarding the padder-cap for 160 operation. > > I do not have a BC-610, nor, other than photos, have I ever seen one. I do > have the Hallicrafters HT4-B, which was made in 1938, and was the basis for > the BC-610. > > In the HT4-B, there is a platform in the rear left corner of the RF > compartment with four banana jacks. These jacks are hard-wired in such a > fashion that if a capacitor were plugged into two of the jacks it would be > in parallel with the variable tune cap. > > I was told, years ago on the air, that this assembly was to be used for a > plugin fixed air capacitor for low frequency operation. > > I use a 50pf vacuum cap for 160 operation, but I'd certainly like to know > more about the plugin air cap. And, if any still exist, because I'd > certainly be in the market for one. > > Also, I'm still looking for the HT5 speech amp. > > TNX, > > Barrie, W7ALW > > > --- > [This E-mail scanned for viruses by Declude EVA] > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami
