15-02-2013, 06:15 PM
OK Mark,
The C21 sorted the Instability. Re-aligned the MW so that L5 was set OK however still no oscillations from TR1 on LW. Had a look at some of the silicon that I had in the drawer and picked a MPS6518, F 150MHz and HFE 150. Swapped out the AF and checked the MW alignment again. Still nothing on LW. Changed the biasing Rs from 1K2 and 6K8 to 10K and 18K as per the RP25B. Whoopee OK ! aligned the LW Great, works fine now on all bands. I think I'll change all the electrolytics in the coming weeks after the C21 performance. (I changed them all on my Sony 7600 a terrible job but worth it)
I'll see if I can get a film ribbon from an old scanner otherwise the ribbon will have to do. I was thinking of some sort of induction system like my toothbrush charger, has anyone done this ? Holes No Way!!!!!!!!!!!!!!!!
I had a look at the Hacker radio group and noticed that you mentioned about probs with the LW LO for the RP25/35 but could find nothing in the manuals on the site.
Anyway thanks for your advice and help, much appreciated.
BRs
Mike
The C21 sorted the Instability. Re-aligned the MW so that L5 was set OK however still no oscillations from TR1 on LW. Had a look at some of the silicon that I had in the drawer and picked a MPS6518, F 150MHz and HFE 150. Swapped out the AF and checked the MW alignment again. Still nothing on LW. Changed the biasing Rs from 1K2 and 6K8 to 10K and 18K as per the RP25B. Whoopee OK ! aligned the LW Great, works fine now on all bands. I think I'll change all the electrolytics in the coming weeks after the C21 performance. (I changed them all on my Sony 7600 a terrible job but worth it)
I'll see if I can get a film ribbon from an old scanner otherwise the ribbon will have to do. I was thinking of some sort of induction system like my toothbrush charger, has anyone done this ? Holes No Way!!!!!!!!!!!!!!!!
I had a look at the Hacker radio group and noticed that you mentioned about probs with the LW LO for the RP25/35 but could find nothing in the manuals on the site.
Anyway thanks for your advice and help, much appreciated.
BRs
Mike
