Ekco U332
The above radio on switch on for about 3 to 4 min the volume is high as normal but after 3 to 4min it just goes right down low in one go not slowly but immediately. Can any one help? Don't know where to look. I have changed the coupling capacitor. But still drops as I said not gradually but immediately. Any one now what it might be? The volume when it goes down is still audible but if you want more there is none.
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Re: Ekco U332
Have you monitored the HT voltage during warm up?
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Re: Ekco U332
No i havent not sure how to do that
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Re: Ekco U332
Can any one tell me how to check the ht voltage if it goes down please
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Re: Ekco U332
Between the +ve of C27 and chassis and between the +ve of C26 and chassis.
Approx. 160 Volts DC and approx. 94 Volts DC respectively according to the service info when supplied with 240 Volts mains. Lawrence. |
Re: Ekco U332
Hi i have taken HT readings go steady as follows C27 is 196/7v and C26 is 90/91v
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Re: Ekco U332
Output valve voltages?
Lawrence. |
Re: Ekco U332
Pin 9 is 44v Pin6 is 198v
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Re: Ekco U332
Output valve voltages?
Lawrence. |
Re: Ekco U332
Not sure what you mean by value voltage
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Re: Ekco U332
Quote:
Try valve electrode voltages. Lawrence. |
Re: Ekco U332
1 Attachment(s)
Lawrence said output valve voltages.
The output valve is V3B, the pentode section of a UCL82. Pin 6 Anode. Pin 7 Screen Grid. Pin 2 Cathode. Pin 3. Control grid. Valve pins number clockwise from the gap or spigot when seen from under the chassis. The DC voltages should be measured with respect to (WRT) chassis. All this is in the manufacturer's service sheet, which is where I got it from. EDIT. Posts crossed. |
Re: Ekco U332
By output valve I mean the UCL82 as a whole....how hard can it be to measure the electrode voltages.....
Lawrence. |
Re: Ekco U332
Very difficult I'd say. It seems to be the very last thing some repairers and restorers want to do. Far easier just to change components in case they're faulty.
I'm an old school dinosaur who adopts a logical approach to fault finding. Meter before soldering iron! |
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