[Milsurplus] BC-611 question

[Mike Feher]

Hue – Since all stages are capacitor coupled with very high resistance grid resistors to reduce power consumption. A slightly leaky coupling cap can make the grid go positive. This would reduce the audio level initially then become distorted until it is so bad that the tube cuts off totally. Have her check the grid voltage of the output tube as well as the others. 73 – Mike  

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

 

From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> On Behalf Of Hubert Miller
Sent: Thursday, May 29, 2025 10:47 PM
To: milsurplus at mailman.qth.net
Subject: [Milsurplus] BC-611 question

 

Julyah Havel, president of the Puget Sound Antique Radio Association, Seattle based, was telling me about this very nice BC-611 she has. ( Yes, believe or not, she really likes old mil eqpt. ) The thing works; somebody in that radio club helped her build a battery adapter. But the audio is real low. I am not at all local to her. The batt voltages are all okay. I told her to check or swap out the 3S4 and then 1S5 tubes first. Are there any common 611 failure modes that otherwise might account for the low audio ?

Nicely enough, the 611 is already on 3885 kHz, and even better, she got it at the closing of a sport and outdoor goods store, and not only that, but she paid a ridiculously low price. Will forward any ideas to Julyah.

-Hue Miller

 

 

 

Sent from my Galaxy

 



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