Hello folks,

It's been a while but I have to revisit this 32volt radiogram. I have another chassis but it's a later version V2278 on the case. On the cabinet they call it a V3278. The original chassis is a V53 and on the cabinet V32 53.

Would anyone have a circuit diagram or service info for the V2278 chassis? These have a vibrator power supply and I think I would prefer to make it a mains only setup. The V2278 uses a 6V4 recifier in the vibrator setup. It also has a sticker that says it can run off 240V. So before one plugs 240V into it , I would like to see if they had any service info on this. Unless there was an optional plug in 240V Transformer that replaced the Vibrator setup.

Any help appreciated.

Regards
Vic

Be careful of the interpretation of running on 240V. Several chasses like that had a modular set up where the Vibrator PSU was removed & the mains one put in its place.

What is the valve line-up for the particular chassis that you seek a schematic for?

What is the valve line-up for the particular chassis that you seek a schematic for?

Hi GTC,

I will post that later today when I get home.This chassis has a different valve line up to the V53, as in it runs 2 6v6 output In push-pull. But the rest are not octal as all the info I have found shows. I did get the vibrator working, but feel it would be a better idea to make it a 240v ac setup . My idea was to change the heater wiring to run 6v and add a power supply from a similar chassis that produces 255v ht.


6AN7 , 6N8 , 6N8, 12AX7 , 6V6 , 6V6 and 6V4 in the vibrator PS

Cheers Vic

Hi Marcc,

I believe that is the case with this one.

Photos uploaded.

I thought there was something familiar about this radio. It looks somewhat like one of my unknown mystery radios, except mine runs on 240 volts.

See https://vintage-radio.com.au/default.asp?f=2&th=684.

Hi Robert,

Yes that looks like the 240V version of the original chassis V53. The dial glass is the same but valve line up is different. Guess that's what I would like get hold of.

Cheers Vic.

6AN7 , 6N8 , 6N8, 12AX7 , 6V6 , 6V6 and 6V4 in the vibrator PS

I have zero matches anywhere for that line-up.

The AORSM mentions these other vibrator models:

Model 61 6/12V, 5/6 valve vibrator auto, Vol 11
Model 624/6/240, 5/6 valve vibrator AC D/W, Vol 11

But they have different lineups. Seems you have a mongrel of some sort.

But they have different lineups. Seems you have a mongrel of some sort.

Mongrel is the word. I have 3 of these all the same. Must of been end of run. Oh well only two choices. Make a 32v power supply or convert all 3 to 240.

Thank you for your help, greatly appreciated.

Regards
Vic

Looking at a few of their sets, some of the vibrator sets are prefixed "V32" What is interesting is that the Vibrator unit is plug in on most of them. That rather suggests that my suspicion re a plug in module is correct.

There is of course the possibility that it has wrong valves in it, it was not built by them and like an Astor universal car radio, which went across the bench here, it had a 6V & 12V module psu option and to top it off it had been factory modified & had 12BA6 in place of 6BA6. So that went on.

What I see as it has a three gang tuner. Probably

V1 TRFstage; 6N8
V2 Pentagrid; 6AN7
V3 IF 6N8 (which has diode plates)
V4 1st Audio 12AX7 Twin triode Phase splittes & drivers
V5 V6 6V6 Push pull output
V7 6x4 HV rectifier.

There may be 39 ohm resistors across most heaters and a dropping resistor to get 18V. Some HMV sets had that sort of RF section.

That lot ony ran from 1946 to1954. Kriesler 11-53 11-54 11-55 had a similar set up but without the TRF stage & ran PP 6AQ5's.