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Old 30th Oct 2018, 12:19 pm   #21
M0FYA Andy
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Default Re: BV-613 receiver

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Originally Posted by Station X View Post
You'll need a Digital Multimeter (DMM) to check the HT voltage.

Negative lead of meter to chassis and positive lead of meter to the smoothing capacitor. The cap is at bottom left of the extract from the circuit.
Why do you need a Digital Multimeter?
A good old analogue meter such as an Avo will work just as well to measure the HT voltage!
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Old 30th Oct 2018, 12:35 pm   #22
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Default Re: BV-613 receiver

Very true, but I didn't want to make the answer unnecessarily long. If the OP, who lives in Spain, has to buy a meter a DMM is probably his best bet as they're more readily available than say an AVO. Quite likely he already has a DMM?
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Old 30th Oct 2018, 1:40 pm   #23
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Default Re: BV-613 receiver

Ok i guess the ones you say are that 2 cylinder cans named C1
Ok, I plan to replace some condesers, and I have made a list. I guess I have to use polyester ones, but what about the others of tubular paper and moulded mica with pf values?
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Old 30th Oct 2018, 2:05 pm   #24
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Default Re: BV-613 receiver

The two cans are designated EC1 and EC2 (EC denotes Electrolytic Capacitor). Each can contains two capacitors, so the designations are EC1A, EC1B, EC2A and EC2B. It's possible these may not need replacing.

Leave the oblong capacitors alone. Capacitors with values in pF rarely fail.

The remaining capacitors were probably paper dielectric types (waxies), but seem to have been replaced with new orange coloured ones.

I strongly suggest not replacing capacitors wholesale, it's a recipe for disaster. Do some voltage tests first. The exception is C11A the grid coupling capacitor, replace this first if it hasn't been replaced already.
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Old 30th Oct 2018, 4:47 pm   #25
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Default Re: BV-613 receiver

Hello!

I have seen that the caps you mention are located on this big can
I have checked dc voltajes on the 3 central pins and these are the results

250v
245v
16v
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Last edited by CesarLG; 30th Oct 2018 at 4:53 pm.
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Old 30th Oct 2018, 5:05 pm   #26
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Default Re: BV-613 receiver

Micamold? If so they should be replaced.

Lawrence.
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Old 30th Oct 2018, 5:24 pm   #27
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Default Re: BV-613 receiver

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Originally Posted by CesarLG View Post
Hello!

I have seen that the caps you mention are located on this big can
I have checked dc voltajes on the 3 central pins and these are the results

250v
245v
16v
Those voltages look OK. They are the HT voltage, output valve screen grid voltage and output valve cathode voltage.

I suggest that next you measure the voltages on all the pins of V4 (the output valve) and V3 the audio amplifier valve. No need to measure the heater pins. There must be no POSITIVE voltage on the control grid of V4.

Do you have an aerial connected? Is there any sound from the speaker?
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Old 30th Oct 2018, 5:47 pm   #28
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Default Re: BV-613 receiver

Hello my aereal is connected, so is the speaker
These are the voltages
There are
5.8v on pin 2
250v on pin 3
225v on pin 4
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Old 30th Oct 2018, 5:52 pm   #29
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Default Re: BV-613 receiver

Something wrong there. You should have a voltage on pin 8 ie the cathode. If the diagram is correct this is the same point at which you measured 16V on the can capacitor. Check the wiring to pin 8.
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Old 30th Oct 2018, 6:17 pm   #30
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Default Re: BV-613 receiver

Hello, apparently the wiring is different from what I have and the actal diagram

Pin5 is connected to pin1 and the capacitor (of s it a resistor bone shaped in violet) goes from 5 and 1 to 8

I do have continuity from that 16v point on the capacitor and pin 8 on v4a
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Old 30th Oct 2018, 6:26 pm   #31
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Default Re: BV-613 receiver

Are you sure you're checking the right valve? It should be a VT52 with pin 3 the anode wired to the output transformer primary.
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Old 30th Oct 2018, 6:36 pm   #32
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Default Re: BV-613 receiver

Quote:
Originally Posted by CesarLG View Post
Hello, apparently the wiring is different from what I have and the actal diagram

Pin5 is connected to pin1 and the capacitor (of s it a resistor bone shaped in violet) goes from 5 and 1 to 8

I do have continuity from that 16v point on the capacitor and pin 8 on v4a
Ignore the previous post.

Pins 1 and 5 are spare pins which have been connected to pin 7 which is connected to the chassis. The resistor is R4A 700R, the cathode resistor.

Do you now have 16V or thereabouts on pin 8?
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Old 30th Oct 2018, 9:37 pm   #33
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Default Re: BV-613 receiver

Yes! 16,2v on pin 8

Thank you for your nice help man! I owe you a beer.
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Old 30th Oct 2018, 10:33 pm   #34
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Default Re: BV-613 receiver

I take it that the set is still not working though.

Remaining checks to be down on the output stage. Check that the output transformer secondary winding and the loudspeaker have continuity. You can test the speaker by connecting a 1.5V battery to its terminals. If it's OK you'll hear a pop and should see the cone attracted or repelled.
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Old 30th Oct 2018, 11:45 pm   #35
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Default Re: BV-613 receiver

Is it ok that the speaker plug has continuity with ground?
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Old 31st Oct 2018, 9:27 am   #36
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Default Re: BV-613 receiver

That's OK. One side of the output transformer's secondary winding is connected to the chassis.
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Old 31st Oct 2018, 9:39 am   #37
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Default Re: BV-613 receiver

OK, I think this signal injector is suitable for the testing.
I will begin in A. If I get to get a beep on the speaker
Then in B and C
IF B or A don't make beep I guess something is wrong in between... right?
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Old 31st Oct 2018, 9:44 am   #38
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Default Re: BV-613 receiver

A better place to inject an audio signal would be first V4A top cap, then V3A top cap.

Have you confirmed that the o/p transformer secondary winding and the loudspeaker have continuity? You'll need to temporarily disconnect one of the speaker wires to check this.

If they're OK there's really no reason why the output stage shouldn't work. The fact V4A has HT means the output transformer primary winding has continuity, the fact there's a voltage on the cathode shows that the valve is passing current and the fact you have screen grid voltage shows that R2A is OK.

Possible problems could be C12A short-circuit or R9B/R5C have changed value.
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Old 31st Oct 2018, 11:45 am   #39
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Default Re: BV-613 receiver

What insee isnthat the speaker has only one wire
Maybe the other one is the chassis itself
I will check those components this afternoon
🙏
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Old 31st Oct 2018, 11:51 am   #40
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Default Re: BV-613 receiver

I think you'll find that what you have there is a jack socket with two contacts. A quick look at the plug which fits the socket and presumably goes to the speaker will confirm this.

If it is just a single wire, you'll need to check where the speaker's other terminal is wired to.
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