From: cd6699@notformail.com   
      
   On Wed, 03 Dec 2025 09:03:25 -0500, legg  wrote:   
      
   >On Sat, 29 Nov 2025 12:47:21 +0000, Cursitor Doom   
   > wrote:   
   >   
   >>On Fri, 28 Nov 2025 19:05:31 +0000, liz@poppyrecords.invalid.invalid   
   >>(Liz Tuddenham) wrote:   
   >>   
   >>>Cursitor Doom  wrote:   
   >>>   
   >>>> On Fri, 28 Nov 2025 11:37:56 +0000, liz@poppyrecords.invalid.invalid   
   >>>> (Liz Tuddenham) wrote:   
   >>>>   
   >>>> >Cursitor Doom  wrote:   
   >>>> >   
   >>>> >>... Time for someone else more experienced with Uhers to take over   
   >>>> >> methinks.   
   >>>> >   
   >>>> >I used to repair them many years ago.  if you live anywhere near Bath,   
   >>>> >drop in and I'll try to help you.   
   >>>>   
   >>>> That's very good of you and I would - but unfortunately I left the UK   
   >>>> many years ago. Thanks, anyway. :)   
   >>>   
   >>>I'm sure I had the circuit diagrams for several of the Uher models - but   
   >>>i have no idea where they are now.   
   >>>   
   >>>I seem to remember the 2-transistor mic pre-amps had a rather clever   
   >>>counter-intuitive volume control arrangement, which gave a wide range of   
   >>>possible volume input levels.  The wiper was connected to the output of   
   >>>the second transistor, with one end of the track going to the followiong   
   >>>stage and the other end going to the emitter of the first transistor.   
   >>>As the volume was turned down it increased the negative feedback around   
   >>>the front end.   
   >>>   
   >>>If you suspect the fault is in the AGC system, do you get an improvement   
   >>>if you switch the AGC off?   
   >>   
   >>Doesn't bring the audio back, I'm afraid. However, that doesn't   
   >>exculpate the AGC, as they've embedded the on/oiff/fast/slow switch   
   >>right in the middle of the stage.   
   >   
   >Troubleshoot in the 'off' position and assume that AGC has nothing   
   >to do with your problem.   
   >   
   >RL   
      
   No doubt good advice, but as I mentioned earlier somewhere, I've kind   
   of lost the will to live with this problem so it's going off to a R-R   
   specialist familiar with Uhers for a full service of the electronics   
   and mechanics. It doesn't cost a fortune for these - unlike the   
   Ferrograph I had serviced earlier this year.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)