Modifying an old PMG era bakelite phone...

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Hi All,

Just wondering if anyone here has modded (or knows how) an old bakelite
rotary phone to work on the modern phone system?

Do we even have pulse dialing anymore - or does that vary from exchange
to exchange?

The few old phones that I have seen indirectly (eg eBay) definitely have
some alteration to the wiring, but its not clear how exactly.

TIA

Re: Modifying an old PMG era bakelite phone...
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being a PMG dinosaur, I'll have a crack at this.
others will prove me wrong of course
you gotta love aus.electronics :-)

To my knowledge pulse dialing should work on all modern exchanges.

Biggest problem is that great thumping bell inside the case. If you
connect two of these monsters in parallel, the bells weaken in sound
output somewhat. Three will usually kill it.

Prescribed method was to remove a link in the phone plug on the wall.
Between screws 2 and 3. This way, you should only have one bell in the
circuit for 2 or more phones. Removing the wiring (inside the case) to
the bell coil, will do the same thing. There is a cap and a coil in
series with screws 2 and 3 as it turns out.

Don...


--
Don McKenzie

Site Map:            http://www.dontronics.com/sitemap
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Re: Modifying an old PMG era bakelite phone...

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Thanks for the help Don. I don't have one of these phones available to
experiment on but know where I can get my hands on a few - for a price,
of course :)


Re: Modifying an old PMG era bakelite phone...
There are several models of PMG bakelite phones, but I'll guess that you mean it
is one of the 300 or 332 series.
http://www.britishtelephones.com/aus/300aw.htm
http://www.britishtelephones.com/aus/332type.htm

They will work on most (if not all) public telephone exchanges in Australia.

I will assume you are talking about a table model. Both schematics were
essentially the same but the casing and construction were different.

When these phones were the standard instrument the usual wall termination block
was the 20/4 terminal block (table model) using hard wiring to screw terminals -
there were no plug and sockets like the 605/610 series as on the later 800
series.

This means that if you want to adapt a 300 series to use the 605/610 plug and
socket you will have to do some minor modification regarding the line cord. If
you want to keep the old line cord (should be 3 conductor Red, Black, Green)
which terminates on the 20/4 terminal block then you will have to modify the
spade terminals so that they can be soldered to the termianls of the 605 plug.
The 605 plug normally uses miniature quick connect female connectors. You will
have to remove the terminals from the plug to solder them otherwise you will
melt the plastic.

In the phone the Black will be on terminal 1, the Red will be on terminal 9 and
the green will be on termnal 2. There should be a link strap between terminals 1
and 2 when used as a normal phone without an extension bell.

In the plug the Black conductor is soldered to terminal 2 while the Red goes to
terminal 6 and the Green to terminal 3.

If a magneto extension bell is required to be fitted this is wired between
terminals 2 and 3 on the 610 socket. Some 610 sockets may have a strap between 2
and 3 so this must be removed, and in the phone the strap between 1 and 2 is
also removed. This arrangement will connect the extension bell in series with
the bell in the phone.


:Hi All,
:
:Just wondering if anyone here has modded (or knows how) an old bakelite
:rotary phone to work on the modern phone system?
:
:Do we even have pulse dialing anymore - or does that vary from exchange
:to exchange?
:
:The few old phones that I have seen indirectly (eg eBay) definitely have
:some alteration to the wiring, but its not clear how exactly.
:
:TIA

Re: Modifying an old PMG era bakelite phone...
Correction:

The 300 series table phone 3 conductor line cord colours are White, Red & Green,
not Black, Red & Green. Substitute White conductor for Black where referred to
in my previous post.

Re: Modifying an old PMG era bakelite phone...
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Green,
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Ross, I'll bet you will be able to recite the standard (base 5) PMG
cable colour code, right down to all combinations of their matching
mates . :-)

Don...




--
Don McKenzie

Site Map:            http://www.dontronics.com/sitemap
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Re: Modifying an old PMG era bakelite phone...


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And remember its Slate, not Grey!   :)



Re: Modifying an old PMG era bakelite phone...
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    Blue, orange, green, brown, slate ....


Bob

Re: Modifying an old PMG era bakelite phone...

:> Correction:
:>
:> The 300 series table phone 3 conductor line cord colours are White, Red &
Green,
:> not Black, Red & Green. Substitute White conductor for Black where referred
to
:> in my previous post.
:
:Ross, I'll bet you will be able to recite the standard (base 5) PMG
:cable colour code, right down to all combinations of their matching
:mates . :-)
:
:Don...


At least for internal 100pr cable. The external UG colour code is a bit more
difficult, although it is far easier than when PIQC lead sheathed cable was the
norm :-)

Re: Modifying an old PMG era bakelite phone...

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Noted and thanks Ross.

Re: Modifying an old PMG era bakelite phone...

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<snip>

Wow, thanks very much Ross for the detailed reply.
I've saved it for future reference as it seems to cover the subject
pretty well :) Now to wait a little longer for the right phone to appear
with the right price (I've let a few mint/cheapies slip by).
Or, I know where theres one not too far away - but for $85, I can wait a
bit more.
Thanks again Ross.

Re: Modifying an old PMG era bakelite phone...
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well, here is what one rotary phone reseller has to say:
<http://www.retro-rotary-phones.com/ccp0-display/where-will-these-pmg-telecom-rotary-dial-phones-work.html

Don...



--
Don McKenzie

Site Map:            http://www.dontronics.com/sitemap
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Re: Modifying an old PMG era bakelite phone...

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telecom-rotary-dial-phones-work.html>

Seems like the old rotary phones are still good on the modern network,
good to hear. Cheers.



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