CHAMP ELECTRONICS -" THE VINTAGE VALVE AMP HOSPITAL"

NOTTINGHAM, ENGLAND

 

SERVICING A SELMER TEBLE N' BASS 100SV AMPLIFIER HEAD



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Coming from Bonnie Scotland, this completely dead and “blowing the mains fuse” amp had already had a fair bit of previous work done.





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Most of the caps had already been replaced and some resistors too…….these were all done fine. 





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As above.

 
  
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All finished. The initial problem with the amp was one shorting HT rectifier diode. I changed both of these and put four in instead (two pairs, each in series). This makes them more reliable than just using two, due to the high in-rush voltage and current. I also replaced the “iffy” power on/off switch.
  

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All amplifiers should have a screen under the chassis, as this reduces stray hum etc. Some companies use a thin piece of aluminium stapled down, whilst others use a kind of adhesive-backed tin foil. As you can see in the photo above, it had been ripped-out of this amp.


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The replaced screening foil.



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All tubes bubble-wrapped and packed-up inside the amp; ready for the return trip to Scotland.


 


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