Re: SX-110 2nd IF Circuit Design
¿ªÔÆÌåÓýJust thinking.. if the intent of the receiver was to function only with weak signals? present, the extra gain of the 6SG7 would be preferable, but if? there were strong in-band signals, the 6SK7 might be preferred. Seems to me ?there must be trade-offs depending on the rf gain[s], the AVC and any bypassing of an Rf amp ?for lower frequencies.. so 6SK7 or 6SG7 isnt a one size fits all. Intermod {IMD} must be in the designer¡¯s mind. ? Reminds me; at about grade 10 in school, and in the pursuit of getting more weak signals from Heathkit AR-3, ?I somehow connected an If output from the AR-3 into the early IF stage of an old console with a good AF amp and speaker; and man oh man; did I get stations¡ all over the dial from 540 kilocycles to 3o MCees. ?I had not yet discovered resonance, let alone intermod! Don VA3DRL ? From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Thursday, October 27, 2022 5:22 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-110 2nd IF Circuit Design ? Thanks, Mike!? In contrast, National often used all 6SG7¡¯s in their IF design (such as in my HRO-60).? The difference is an interesting point. ? 73 ¨C Steve, KW4H ? From: <[email protected]> on behalf of Mike Langner <mlangner@...> ? Hello Steve! ? I hope this helps! ? Mike Langner (505) 898-3212 home/home office ? From: [email protected] <[email protected]> On Behalf Of KW4H via groups.io ? All, ? A curiosity ¨C I¡¯m restoring a SX-110 at the moment and see that a 6SK7 was used for the 2nd IF, while a 6SG7 is used for the 1st IF.? I¡¯m trying to understand why that is ¨C why not use two 6SG7¡¯s?? What was magical about the 6SK7? ? 73 ¨C Steve, KW4H ? |
don Root