Hi All

Just picked up an example of the Healing 401A and it has been modified by someone in the past. Does anyone out there have the service data for that set and some detailed photos of the Vibrator Unit and associated transformer and caps.

The set I have has a replacement Speaker, Mains Transformer, Unknown rectifier

I am yet to pull the chassis out so unsure what that will hold for me... Got told it works

See how that pans out!

I have sent the schematic and notes to your email address.

Some photos on this site: http://www.philipstorr.id.au/radio/thirteen/collection.htm

The owner of that site is in Nairne. He may be able to help you with information.

His contact details are here: http://www.philipstorr.id.au/

Hmm... I will chase down Phil and see if he has any other information.

Oh Bugger

I Extracted the chassis today in between doing the house reno and found a nasty surprise. There is a diode bridge, bunch of random caps, 3 terminal Voltage reg and Transistor......

Looking for a donor chassis or parts now to make something original out of this.

Photos are on there way

Sounds like someone added a "battery eliminator"..

Just noticed staring into the abyss that is the chassis, there is a M-2840 transformer that has been pressed into service at the O/P Transformer..... That gives me a impedance of roughly 5660K
(240/9)=26.6
Sq=707.56
8 x 711.12889 = ~5.660K

Thats too low for a 1L5G (15K)

Might just put this on the shelf for a while until a donor chassis is found......

Photos uploaded.

When it looks like a radio has been modified to the hilt it is time to start from scratch with it I reckon. Marc has lots of horror stories coming from similar situations.

Another oddity is Healing's oddball model naming convention. This radio is indeed a 401A, obviously modified to run from the mains. However, Healing's tiny 401E is a four valve mantel receiver. I now have seven of them in different colours. I wonder why Healing gave a similar model number to two vastly different radios.

Another oddity is Healing's oddball model naming convention.

Actually the Healing model designation system is quite descriptive:

The first figure indicates the number of valves used (4 = 4 valve set)

The second & third/fourth figure not quite sure, but probably cabinet style, material etc.

The last letter is most important as it describes how the set is powered, with the exception of radiograms & transistor sets:

A - Vibrator.

B - Battery.

C - AC/DC.

D - 32V.

E - AC.

G - Gram/Radiogram.

H - Battery/AC.

T - Transistor.

TG - Transistor Gram/Radiogram.

I had a converted vibrator Healing in here recently, wonderful half a job on the caps. That chain of Ecaps looks a lot like a voltage tripler (perhaps more).

If it uses the same valves as the one I had what might look like a T03 Transistor, could be a regulator for the filaments and they will have a rectifier.

There might be something like LR8 controlling a TIP55 for the "B" voltage. I have used that regulator on some vintage battery sets and in a reformer. Max input around 450VDC it will regulate down to 5V.

One of the local servicemen often used small mains transformers for speaker transformers.

You may be better to get the circuit & analyse what has been done first.

Hi Guys

Thanks for all that good information. I never thought of those caps as being a voltage tripler. I have shelved it for a few weeks because I have to go O/S for a Work trip.

I have located (Emailed to me) a diagram for this set and there seems to be alot of changes. All the old vibrator parts are missing and so it at least one of the Filter Chokes. This is evident by what is no there and the Photos on Phil's Site referenced above.

All the valves are correct with the output being suspect as the markings have been rubbed off. Its a Philips Valve and has the usual number on the Bakelite Octal Base that I will use to do a reference check to find the type.

Well Its about time for an update.

I was at a local HRSASA auction on the weekend and picked up another whole radio. It is a VIbrator Model that is almost original. The only thing wrong it it is missing its dial glass.

I might consider using the new chassis in my case.....

Dan

I could be interested in the chassis and valves from your modified unit as the 401 I was given had the chassis stripped and a transistor radio put in side. (used in shearing shed)

Please email me if interested.

Pity, it looks a neat enough job for a vibrator conversion. Looks to me like whoever did it knew what he was doing.

Mismatch of output transformer shouldn't matter too much, max output will probably be down by 6dB and be accompanied by a slight increase in distortion. Certainly shouldn't stop it working.

Hi Clive

Not too sure what I am going to do with it as yet. The case is way too good to "Throw" out. I am unsure as to what is going to happen with it.

Ian

Might be a good conversion but the overall presentation inthe radio was a bit rough. Its going to be my next project when I finish another Philips that I will write an article for...