Just bought a Philips Valve Limiting Amplifier, EX 5AD Radio in SA.
Slightly later period than when my Father worked there.
Will clean up well and Valves test ok.
Could only find 1 Recording Studio in Melbourne with one and no other info.
Looking forward to getting it going.

Josh

Would be quite valuable as top studios today like to have classic processing equipment like the highly prized Fairchild Limiter from the 1950s.

So you need to get it back to original, removing that solid state Mod.

Removing the add-on is the next thing on the list.
Would love the circuit diagram etc but just don't seem to be out there.
Josh

I just noticed under the bodge board is a nice Western Electric style transformer! Any brand on that transformer? This is fully featured with much processing circuitry. What brand are the valves? And is it from Holland or Philips (Aust,)?

The transformer is actually a Trimax and is the input balancing transformer.
The valves are mostly Miniwatt and we reckon it is Australian Philips made
BUT possibly Philips Holland design as it doesn't look like it a standard Philips design build.
As there in no badge and the Philips number is just stamped into the metal work.
They were either made by request (as there just doesn't seem many out there)
Or they were possibly an option with their transmitters.
Josh

One thing that would indicate that it is made here is the Meter. It looks like Master Instruments & the dial of it may be a custom job, by them.

Marc

Definatley a Master Instruments also the Trimax is original.
The funny part is the DB part of the Meter is hand drawn, thought this might just be
mine but the one we found the photo of in Melbourne is also hand draw.
That was another reason we thought these might be a non standard Philips line.

Josh

I would say that the internals of the meter were a standard line, but it was hand calibrated for the end use.

I have just sorted (to a point) a US BC221N Frequency Meter. It has a calibration booklet, that has a typed vernier setting for every whole frequency in its range. 125kHz -20MHz 71pages with about 50 entries per page.

Compare that to a modern frequency counter & compare its accuracy, to that of the labour input & accuracy of this wartime unit.

I would suggest that your instrument is a custom job and there would not be many in a batch. I have seen an Astor TV analyser and an AWA Radio that fitted that category as well.

Marc

Definatly a standard meter calibrated to suit.
It's nice to get something that's a little unusual, on the flip side
getting info on them is almost impossible, 1 of the valves had
part of the type rubbed off and not marked anywhere else.
I actually worked out ( a little by accident) what it was.

Josh