Truvox PD104 circuit - UK Vintage Radio Repair and Restoration Discussion Forum

SimJam56 · 26th Jan 2020, 3:21 pm

Hello All,
I'm a new member to this forum but have it very useful in the past as I am keen on vintage restoration of tape recorders and other electronics, amps tuners etc.
I am currently restoring two Truvox PD104 units. One was in good condition electrically but broken casing, the other poor in all respects. I have repaired the mechanics, woodwork and some of the electronics but I am having problems fault finding as I have no circuit diagrams for these units. Some of the heads being Bogen have gone, (now replaced), but in one instance, on record both channels work at first then on fades away. Other problems also occur.
Has anyone got or know of where I can obtain the circuit diagrams? I am happy to pay for these if required. The Truvox machines are very well built and deserve the repair.
I did look on Vintage Radio Service Data, where I got mechanical service info, but no circuits.
Thanks very much.

Ted Kendall · 26th Jan 2020, 5:44 pm

Try the American Radio History website. In Tape Recorder (Studio Sound) there were both servicing articles for the 100 series and a review of the siliconised PD202, with a circuit diagram, which is very close to the 100 seies apart from the change of devices. Date about 1969...

SimJam56 · 26th Jan 2020, 6:29 pm

Ted,
Many, many thanks. I had used the American history website before but looking in the UK section.
For future users reference, the date is March 69.

26th Jan 2020, 3:21 pm	#1
SimJam56 Diode Join Date: Jan 2020 Location: Salisbury, Wiltshire, UK. Posts: 2	Truvox PD104 circuit Hello All, I'm a new member to this forum but have it very useful in the past as I am keen on vintage restoration of tape recorders and other electronics, amps tuners etc. I am currently restoring two Truvox PD104 units. One was in good condition electrically but broken casing, the other poor in all respects. I have repaired the mechanics, woodwork and some of the electronics but I am having problems fault finding as I have no circuit diagrams for these units. Some of the heads being Bogen have gone, (now replaced), but in one instance, on record both channels work at first then on fades away. Other problems also occur. Has anyone got or know of where I can obtain the circuit diagrams? I am happy to pay for these if required. The Truvox machines are very well built and deserve the repair. I did look on Vintage Radio Service Data, where I got mechanical service info, but no circuits. Thanks very much.

26th Jan 2020, 5:44 pm	#2
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,670	Re: Truvox PD104 circuit Try the American Radio History website. In Tape Recorder (Studio Sound) there were both servicing articles for the 100 series and a review of the siliconised PD202, with a circuit diagram, which is very close to the 100 seies apart from the change of devices. Date about 1969...

26th Jan 2020, 6:29 pm	#3
SimJam56 Diode Join Date: Jan 2020 Location: Salisbury, Wiltshire, UK. Posts: 2	Re: Truvox PD104 circuit Ted, Many, many thanks. I had used the American history website before but looking in the UK section. For future users reference, the date is March 69.