Author Topic: Help!- Heefmaf PPT Dialing Pops and Ringing Problems  (Read 3503 times)

Online countryman

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Re: Help!- Heemaf PTT 1955 Dialing Pops and Ringing Problems
« Reply #30 on: July 13, 2019, 04:06:33 PM »
My Heemaf from this thread arrived.
It also pops POPS! like described in the original post. It has no diode limiter. For a test I connected a limiter from a german phone of the same age, with almost the same wiring setup. Pop is gone.
I measured a limiting voltage of 0.4 V with my multimeter, so it would be more like 2 germanium or schottky diodes than like usual silicon diodes (0.7 V).  *)
The phone has an efficient receiver element with a loud and clear sound. My guess is the problem with popping noise from switches became urgent with this generation of receiver elements.
The phone has Philips logos on the plungers and no PTT marks. It should be an export version. I'm not going to venture about it's provenience any more, considering the reverse dial. According to the seller the previous owner was a (german) employee of the U.S. army signal corps at the Heidelberg base.

The phone cleaned up nicely, no damages, everything seemed untouched and original. Once again my well tried plastics cleaner had to cut through a daunting layer of cigarette tar.  The moldy look of the auction picture is gone now and the phone has a matt finish. It almost looks like it was made this way, but under the handset and on the inside it is shiny. I think it would polish up nicely, but I'll preserve the look for now.
I also guess I could replace the number ring with a normal 1...0 Siemens&Halske part (the dial is a clone of the german S&H N38), but it's not too bad to use like it is as the 0 and the 5 are in the right place. Swedish 012..9 dials are worse.

My phone rings nicely on my VOIP router. Not overly loud, but nice. The router does not offer too much ringing power, some other phones won't ring reliably with it.

*) Edit: According to Wikipedia the gernman noise limiters were made of selenium diodes.
« Last Edit: July 14, 2019, 05:09:30 AM by countryman »

Offline twocvbloke

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Re: Help!- Heefmaf PPT Dialing Pops and Ringing Problems
« Reply #31 on: July 14, 2019, 11:29:07 AM »
With that matte finish, it could be considered as a stealth communications telephone... ;D

Offline rdelius

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Re: Help!- Heefmaf PPT Dialing Pops and Ringing Problems
« Reply #32 on: July 14, 2019, 11:42:33 AM »
It appears that the dial has the Heemaf logo.It is possible that just the number plate was switched.

Online countryman

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Re: Help!- Heefmaf PPT Dialing Pops and Ringing Problems
« Reply #33 on: July 14, 2019, 12:52:22 PM »
In fact the dial is a Heemaf. That all looked very much original.

It had a sticker "No classified matter will be discussed over this phone" on it. It was easily removable for cleaning. I preserved the sticker and could reattach it.