BV-613 receiver - Page 3 - UK Vintage Radio Repair and Restoration Discussion Forum

CesarLG · 31st Oct 2018, 2:49 pm

Hello!

It is a single wire cable

The connections on the speaker are weird to me as both poles are connected with continuity and one of the sides is grounded

Does it makes sense?

Station X · 31st Oct 2018, 3:06 pm

It looks like one connection is via the chassis, so you'll need to make a temporary connection from the radio's chassis to the front panel.

That's assuming the lead with the wander plug goes to the left hand terminal of the speaker?

The socket is J1A.

With the speaker in its current state you can easily check continuity of the coil and do a 1.5V battery test.

A resistance check between the speaker socket on the radio's chassis and the radio's chassis will show whether the output transformer secondary winding has continuity.

CesarLG · 31st Oct 2018, 3:50 pm

Hello!

The wiring to chasis worked
I have checked the top tubes with my injector

https://youtu.be/jf_E0FiJTqQ

I have injected right in the antenna wire with nothing showing up though

Station X · 31st Oct 2018, 3:58 pm

The aerial wire you've circled looks more like an earth to me.

Try injecting signals on both sides of the yellow capacitor, which appears to be in series with the aerial wire. It's not shown on the circuit diagram.

CesarLG · 31st Oct 2018, 4:33 pm

It works now!
I get stations clearly!

Thank you very much!

This was a multi fail debugging but with your help this litte green radio is back to life! It’s been very kind if you

Thank you Graham

Station X · 31st Oct 2018, 4:46 pm

Good to know that it's working, but apart from fixing the vibrator and connecting the front panel to the chassis I can't see that any repairs have been done?

CesarLG · 31st Oct 2018, 8:59 pm

There was a bad soldering in the speaker pad. The vibrator is still erratic so I am thinking about a solid state one
For now I am happy with it
https://www.youtube.com/watch?v=RCBBpGyKaFk

Station X · 31st Oct 2018, 9:34 pm

If you fancy building your own SSV:-

https://www.vintage-radio.net/forum/...ad.php?t=41944

WB6NVH-GEOFF · 5th Nov 2018, 5:04 pm

That is basically a Philco automobile radio of the 800 series from the USA. It is very much not an easy set to rebuild for the beginner. One reason is that it has the execrable Philco "block condensers," a Bakelite rectangular housing with three lugs on the top, the interior of which will contain two or three low quality paper capacitors potted in black pitch. These have to be removed and the pitch heated, while the innards are dug out and replaced with modern types, as the original blocks will all be quite leaky by now. I was surprised this set works at all as they are still in place, although it looks like some have been bypassed by modern capacitors on the outside. Possibly someone has already rebuilt them? The subject can be discovered by a Google search for "Philco block condensers."

I had not seen this example before. The original Philco broadcast car radios used a separate control head and tuning dial and were wrinkle black finish. 6 Volt DC input of course. A special crystal controlled model was also made for Police, which operated on one frequency in the 1500-2500 kHz band.

A fairly close schematic might be obtained by extrapolating from a Philco auto radio service sheet of the 800 Series from a source such as Nostalgia Air.

CesarLG · 6th Nov 2018, 8:31 am

Yes, the caps were there bypassing the old ones
I am going to change the Electrolitic ones as well. They are inised a single barrel, I wonder If I will be able to tear open it and put them all inside

CesarLG · 13th Nov 2018, 11:35 pm

I have been working on the solid state vibrator
I have built up a small corcuit but something must be wrong as i get no sound

May it be that I used a 6.2v zener instead of 6.1?

CesarLG · 14th Nov 2018, 12:31 am

This is the diagram I use

Station X · 14th Nov 2018, 2:25 pm

0.1V difference in the Zener voltage won't make any difference. Check that you have 6.2VDC across the Zener.

The next step is to check that a square wave is present on the collectors of the 2N2222's. A scope is ideal for this, but the frequency is generally so low that if you check the voltages with an analogue meter you may be able to see the needle vibrating.

CesarLG · 14th Nov 2018, 9:08 pm

Inyave been replacing that caps on the bakelite housing
Sound is much more clear now, but a little quieter

The vibrator is working but a little bit erratic. Sometimes it turns off and restarts itself

The solid state circuit is still in debugging

Thank you for your help

31st Oct 2018, 2:49 pm	#41
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver Hello! It is a single wire cable The connections on the speaker are weird to me as both poles are connected with continuity and one of the sides is grounded Does it makes sense? Attached Thumbnails __________________ EA3IAV

31st Oct 2018, 3:06 pm	#42
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: BV-613 receiver It looks like one connection is via the chassis, so you'll need to make a temporary connection from the radio's chassis to the front panel. That's assuming the lead with the wander plug goes to the left hand terminal of the speaker? The socket is J1A. With the speaker in its current state you can easily check continuity of the coil and do a 1.5V battery test. A resistance check between the speaker socket on the radio's chassis and the radio's chassis will show whether the output transformer secondary winding has continuity. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

31st Oct 2018, 3:50 pm	#43
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver Hello! The wiring to chasis worked I have checked the top tubes with my injector https://youtu.be/jf_E0FiJTqQ I have injected right in the antenna wire with nothing showing up though Attached Thumbnails __________________ EA3IAV

31st Oct 2018, 3:58 pm	#44
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: BV-613 receiver The aerial wire you've circled looks more like an earth to me. Try injecting signals on both sides of the yellow capacitor, which appears to be in series with the aerial wire. It's not shown on the circuit diagram. Attached Thumbnails __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

31st Oct 2018, 4:33 pm	#45
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver It works now! I get stations clearly! Thank you very much! This was a multi fail debugging but with your help this litte green radio is back to life! It’s been very kind if you Thank you Graham __________________ EA3IAV

31st Oct 2018, 4:46 pm	#46
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: BV-613 receiver Good to know that it's working, but apart from fixing the vibrator and connecting the front panel to the chassis I can't see that any repairs have been done? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

31st Oct 2018, 8:59 pm	#47
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver There was a bad soldering in the speaker pad. The vibrator is still erratic so I am thinking about a solid state one For now I am happy with it https://www.youtube.com/watch?v=RCBBpGyKaFk Attached Thumbnails __________________ EA3IAV

31st Oct 2018, 9:34 pm	#48
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: BV-613 receiver If you fancy building your own SSV:- https://www.vintage-radio.net/forum/...ad.php?t=41944 __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

5th Nov 2018, 5:04 pm	#49
WB6NVH-GEOFF Tetrode Join Date: Aug 2013 Location: Monterey, California USA Posts: 51	Re: BV-613 receiver That is basically a Philco automobile radio of the 800 series from the USA. It is very much not an easy set to rebuild for the beginner. One reason is that it has the execrable Philco "block condensers," a Bakelite rectangular housing with three lugs on the top, the interior of which will contain two or three low quality paper capacitors potted in black pitch. These have to be removed and the pitch heated, while the innards are dug out and replaced with modern types, as the original blocks will all be quite leaky by now. I was surprised this set works at all as they are still in place, although it looks like some have been bypassed by modern capacitors on the outside. Possibly someone has already rebuilt them? The subject can be discovered by a Google search for "Philco block condensers." I had not seen this example before. The original Philco broadcast car radios used a separate control head and tuning dial and were wrinkle black finish. 6 Volt DC input of course. A special crystal controlled model was also made for Police, which operated on one frequency in the 1500-2500 kHz band. A fairly close schematic might be obtained by extrapolating from a Philco auto radio service sheet of the 800 Series from a source such as Nostalgia Air.

6th Nov 2018, 8:31 am	#50
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver Yes, the caps were there bypassing the old ones I am going to change the Electrolitic ones as well. They are inised a single barrel, I wonder If I will be able to tear open it and put them all inside Attached Thumbnails __________________ EA3IAV

13th Nov 2018, 11:35 pm	#51
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver I have been working on the solid state vibrator I have built up a small corcuit but something must be wrong as i get no sound May it be that I used a 6.2v zener instead of 6.1? Attached Thumbnails __________________ EA3IAV

14th Nov 2018, 12:31 am	#52
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver This is the diagram I use Attached Thumbnails __________________ EA3IAV

14th Nov 2018, 2:25 pm	#53
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: BV-613 receiver 0.1V difference in the Zener voltage won't make any difference. Check that you have 6.2VDC across the Zener. The next step is to check that a square wave is present on the collectors of the 2N2222's. A scope is ideal for this, but the frequency is generally so low that if you check the voltages with an analogue meter you may be able to see the needle vibrating. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

14th Nov 2018, 9:08 pm	#54
CesarLG Tetrode Join Date: Apr 2018 Location: Barcelona, Spain. Posts: 62	Re: BV-613 receiver Inyave been replacing that caps on the bakelite housing Sound is much more clear now, but a little quieter The vibrator is working but a little bit erratic. Sometimes it turns off and restarts itself The solid state circuit is still in debugging Thank you for your help Attached Thumbnails __________________ EA3IAV