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 H G Palmer PPS1P stereo record player
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 Return to top of page · Post #: 1 · Written at 8:55:54 PM on 25 March 2018.
Steve Rasher's Gravatar
 Location: Penrith, NSW
 Member since 25 March 2018
 Member #: 2230
 Postcount: 4

Trying to restore an early 1960's record player and need the circuit diagram to work out the output transformer wiring, It has a 6bm8 for each channel which may be the correct valve and if so the primary is 7K ohms however there must be feedback links in the secondary. That is what I need to figure out?


 
 Return to top of page · Post #: 2 · Written at 9:14:25 PM on 25 March 2018.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 412

Brand and model number would be handy.
Welcome to VR.
JJ


 
 Return to top of page · Post #: 3 · Written at 9:50:31 PM on 25 March 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6016

H G Palmer PPS1P, similar to this?

https://www.radiomuseum.org/r/hgpalmer_rgs1p_1006.html


 
 Return to top of page · Post #: 4 · Written at 10:01:44 PM on 25 March 2018.
Steve Rasher's Gravatar
 Location: Penrith, NSW
 Member since 25 March 2018
 Member #: 2230
 Postcount: 4

Here is a link to the exact model however there's no circuit or valve line up

https://www.radiomuseum.org/r/hgpalmer_pps1p_902.html


 
 Return to top of page · Post #: 5 · Written at 10:07:08 PM on 25 March 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6016

Dunno how I missed that!

The entry says it's referenced in J. R. Publications "Television Service Handbook", which strikes me as bizarre, however someone on here may have that.


 
 Return to top of page · Post #: 6 · Written at 10:22:33 PM on 25 March 2018.
Steve Rasher's Gravatar
 Location: Penrith, NSW
 Member since 25 March 2018
 Member #: 2230
 Postcount: 4

Maybe Stuart is a member of HRSA and I could contact him through radio waves.


 
 Return to top of page · Post #: 7 · Written at 7:32:35 AM on 26 March 2018.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1133

There is a Titan/KGH portable stereo model/type NPK that has a 6BM8 for each channel & feedback from the secondary. This feedback consists of a 2.2K resistor going to the wiper of the tone control. The NPK has a solid state rectifier but other versions may have used a valve type.


 
 Return to top of page · Post #: 8 · Written at 10:33:38 AM on 26 March 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6016

Maybe Stuart is a member of HRSA and I could contact him through radio waves.

Stuart is a member here. You can contact him as Sirwin:

https://vintage-radio.com.au/default.asp?f=userlist&offset=19


 
 Return to top of page · Post #: 9 · Written at 4:15:07 PM on 26 March 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1912

I pulled a mono one of those HGP portable record players apart as a kid.

Yes, Titan / KGH.

The one I knew had a 6V4 and a 6BM8.


 
 Return to top of page · Post #: 10 · Written at 11:15:25 PM on 26 March 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6016

.Steve, the feedback most likely runs from the secondary through a series resistor to the wiper of the tone control. You'll need to get the phasing right to avoid positive feedback oscillation.

If you unhide your email address via Control Panel I'll send you something that will probably be close enough to what you have to be useful.


 
 Return to top of page · Post #: 11 · Written at 12:02:54 AM on 27 March 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4351

With HG Palmer, it could be made by anyone. However, it could be based on HMV Chassis 01 which is stereo. It uses an ultra linear amp which has tapped primaries on the OP transformer. That tapping is B+ The end opposite to plate is in series with 1.5K going to pin 7 of the 6BM8 which is the Pentode screen.

This one originally had a metal rectifier: Metal rectifiers had a habit of producing a cloud of toxic smoke. B Voltage 245VDC at full wave rectifier Secondary 222 VAC. 20,000 OPV Analogue Voltmeter.

O1 has two electrolytic filter caps one directly on B the second on the screen after the 1.5K. One on the Cathodes and another on the Balance. Those may have dried out or lost "form" (polarity) use 500V or more filter caps on B If this is the one?

I have the HMV data on that chassis.


 
 Return to top of page · Post #: 12 · Written at 7:31:07 AM on 27 March 2018.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1133

All HG Palmer products of that early 60's era were made by KGH. No if's or buts.

Here are the circuits for the NPK with solid-state (silicon diodes) rectifier & the NLK radiogram version with the same amplifier but with a 6V4 rectifier. I am certain the amplifier section of the PPS1P will match either of these circuits.

Titan NLK Circuit Diagram
Titan NPK Circuit Diagram


 
 Return to top of page · Post #: 13 · Written at 9:55:22 AM on 27 March 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4351

Interesting: We had a HG Palmer TV & it was Stromberg Carlson.


 
 Return to top of page · Post #: 14 · Written at 10:43:11 AM on 27 March 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1912

Both Stromberg and KGH made for HG Palmer. Stromberg only did TVs for them, and then not after 1961 when they failed due to the credit squeeze. KGH were the only survivors.

HMV NEVER made OEM products for HG Palmer.


 
 Return to top of page · Post #: 15 · Written at 10:57:36 AM on 27 March 2018.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1133

Yes Marc, you are correct. Early HG Palmer tellies were made by Stromberg Carlson.

According to an article by Neville Williams there was a price war between Stromberg Carlson & Admiral. This all happened around the 1960 credit squeeze which ended up killing both of them. Both companies had an over supply of tellies when the squeeze hit. H.G Palmer first did a deal with Admiral, purchasing at least half their TV production at a discounted rate. Stromberg Carlson then came along and undercut Admiral by offering HG Palmer a better deal. Then another company shortly afterwards (probably KGH) pulled the rug from under Stromberg Carlson.

In late 1960 Admiral dumped a few hundred of their Australian made 23" tellies in Rhodesia (now Zimbabwe), which at the time had just introduced a television service & had a shortage of receivers.

I can only imagine that when HG Palmer went under they probably dragged KGH down with them!


 
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