Well, sure, if you do something about the bandwidth choices, and the audio.
Instead of paying what they are going for now, I think its much better to get a 75s1 for around $200.00/$300.00 and installing a kiwa filter in place of the back to back IF cans, and doing something about the audio, an internal IC chip running 5 watts, or an external audio amp, or even a sub board with a pair of push pull output tubes like 6aq5,s or something. Its much cheaper, smaller, just as stable and accurate. It does not have the same looks as a 75A4, but those are going for about $1000.00, then you have to hack it up to install other filters and audio If you have a 455Khz IF, Kiwa makes a filter board with two filters, switched in circuit by diodes. A very small switch is all that is needed, or you can use your own switch/spare contacts on an existing switch. Other receivers can be great, if they have a 455Khz IF, the r388, all the 75a receivers, the 75s receivers, other old receivers that have a 455Khz IF can have two choices of mechanical filter like bandwidth at low cost. Almost all receivers really benefit from a hi fidelity audio amp with big speaker. If you have a lot of receivers, it makes a lot of sense to go with ONE good amp and ONE big speaker. Makes it easy to record off the air, takes up less space, sounds really good, and saves loads of space. My Scott has a built in speaker, small but good sounding, and I do have a separate speaker hooked up to the SX17 for that great push pull output sound, but cant say they sound better than the Marantz amp. Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Donald Chester > Sent: Sunday, November 02, 2003 11:15 AM > To: [email protected] > Subject: RE: [AMRadio] FW: Homebrew receiver > > > > >My favorite style was the Collins 75a series > > I use a 75A4, which is often bashed by the AM folks, but I > find it to be > about the best receiver I have ever tried. If I find a truly > superior > receiver to the A4, I'll retire mine and change over to that. > > The main deficiency of the A4 is the audio. I use an > outboard AF amp (an > old 50's vintage 10w hi-fi amplifier using a pair of 6V6's in > pushpull). I > changed the .01 mfd coupling caps in the low level audio > stages of the > receiver to 0.1. Actually, I just bridged the .1's across > the originals, to > minimise melted plastic insulation on the wiring in the > receiver. I pulled > out the original 6AQ5 to save unnecessary drain on the power > supply and to > reduce heat generation. I also clipped out a couple of 510 > pf mica caps > that were added in later models to attenuate the high > frequency response. > From the diode detector to the audio output, the frequncy > response is now > almost flat from 30~ to about 5000~. > > On one of my A4's I added an outboard box with additional mechanical > filters. The stock 3 selectivities is not enough if you want > cw, ssb plus > optimum AM under a variety of band condx. > > Don K4KYV > > _________________________________________________________________ > Want to check if your PC is virus-infected? Get a FREE > computer virus scan > online from McAfee. > http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 > > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio
