Monkey Wards Model 62-465 Dial Stringing Diagram Needed

[jr_tech]

Originally Posted by init4fun

Don't open it yet .....

The thing here is, the vibrator may be fine, the fact that your 6V battery became a one volt battery under load means that you weren't providing the radio with the power it needs. Despite what the ratings say I still don't believe a 6V lantern battery could ever provide the "inrush" power needed to start the vibrator. As you may know about incandescent bulb theory, for a couple of milliseconds upon being powered up the cold filament draws MAD amps, way more than you'd ever believe, to heat the filament to white hot where it's resistance goes way UP and the inrush current subsides. With your vibrator, upon initial application of power the stopped contacts that haven't yet started moving are presenting the transformer's primary winding as an almost dead short to your power source , a microsecond or two later once the vibrator starts that initial inrush of current it took to get the vibrator buzzing subsides to the normal running current of the device (which of course is MUCH lower than the starting current).

Old Coot has given you one Hell of a generous offer and I wouldn't be surprised if that battery starts that ol vibrator, if not, only then, provided all the tube heaters and pilot light are on, if it don't start, THEN contemplate taking it apart. As to your fear of hurting something by using the rechargeable battery, remember, the 4A fuse is there to save the day if there are any hard short circuits in the radio.

Agree...the vibrator may be ok, don’t open it yet.

Agree...high inrush current may be the problem, BUT a 6 volt lantern battery that measures 5.5 volts with no load is very tired. Results may be different with a fresh alkaline battery.

Agree... OC’s offer is very generous, big thumbs up for OC.

jr

[vortalexfan]

Originally Posted by jr_tech

Agree...the vibrator may be ok, don’t open it yet.

Agree...high inrush current may be the problem, BUT a 6 volt lantern battery that measures 5.5 volts with no load is very tired. Results may be different with a fresh alkaline battery.

Agree... OC’s offer is very generous, big thumbs up for OC.

jr

I sent old coot a pm but haven't heard back from him yet. I actually paralleled 3 6V lantern batteries together and hooked them up to the radio and turned the radio on and measured the voltage and the voltage was around 5.8V with the radio on and the tubes did light up, but there was no audio and I didn't hear anything from the vibrator.

I did then return the 2 Duracell lantern batteries to the hardware store and got my money back, which I'll use for the battery OC is offering me.

I have an old 1960s vintage 6/12 V battery charger that was my grandfathers that I can use to recharge the battery that OC is offering me (which I did accept his offer, but I haven't heard back from him yet).

[init4fun]

Originally Posted by vortalexfan

I sent old coot a pm but haven't heard back from him yet. I actually paralleled 3 6V lantern batteries together and hooked them up to the radio and turned the radio on and measured the voltage and the voltage was around 5.8V with the radio on and the tubes did light up, but there was no audio and I didn't hear anything from the vibrator.

I did then return the 2 Duracell lantern batteries to the hardware store and got my money back, which I'll use for the battery OC is offering me.

I have an old 1960s vintage 6/12 V battery charger that was my grandfathers that I can use to recharge the battery that OC is offering me (which I did accept his offer, but I haven't heard back from him yet).

At the point where the paralleled lantern batteries lit the tubes, the next step would have been to give the vibrator a sharp rap on it's side with the handle of a screwdriver and see if that got it to start. Not hard enough to dent it of course, but enough of a hit to hopefully dislodge the possibly stuck contacts. I still wouldn't take it apart till OC's battery arrives, if that much available current don't get it buzzing then yeah it's surgery time.

[vortalexfan]

Originally Posted by init4fun

At the point where the paralleled lantern batteries lit the tubes, the next step would have been to give the vibrator a sharp rap on it's side with the handle of a screwdriver and see if that got it to start. Not hard enough to dent it of course, but enough of a hit to hopefully dislodge the possibly stuck contacts. I still wouldn't take it apart till OC's battery arrives, if that much available current don't get it buzzing then yeah it's surgery time.

Ok. Thanks.

[old_coot88]

It's on its way.

[vortalexfan]

Originally Posted by old_coot88

It's on its way.

Great, thanks! I'll be the owner of the radio once I get a couple of radios going for the guy that I've been working on.

[old_coot88]

Just a cautionary note though. If it's a synchronous vibrator (mechanical rectification), be sure the supply polarity is correct. If it's backward, the B+ will also be backwards, throwing reverse polarity on the main filter caps. Whereas with tube rectfication the supply can be either polarity.

[dieseljeep]

Originally Posted by vortalexfan

Great, thanks! I'll be the owner of the radio once I get a couple of radios going for the guy that I've been working on.

I dealt with people like that!
They want the world for the items they have, but want you to repair their stuff for nothing, part and labor.
I quit taking in repairs!