Philips 834A volume pot - UK Vintage Radio Repair and Restoration Discussion Forum

trabant · 26th Aug 2019, 7:49 pm

Does anyone know the correct value and wattage of the volume pot for this set?

Nanozeugma · 26th Aug 2019, 9:10 pm

From the Philips service sheet, the volume control appears to comprise R1, R15 and R18 which are given as 1200, 300 and 330 ohms respectively.

This thread in a German forum gives an image of the device (scroll down) and some idea of the complexity.

https://radio-bastler.de/forum/showthread.php?tid=10661

Sideband · 26th Aug 2019, 9:41 pm

It's basically a tapped wirewound pot. Ben_Dijkman who is a member of these forums used to supply new inserts for these pots. He may have some left. Look him up in the member section and send him a PM him with the model number of the set and the values of the pot (there are different types).

telstar · 4th Nov 2019, 12:11 pm

Ben supplied me with one of these controls many years back. It is not in the audio stages of the radio, but in the "front end".
Not sure if it is true or not, but someone told me once that these devices could be replaced by other components (can not think of how that could be achieved)?

'LIVEWIRE?' · 4th Nov 2019, 1:33 pm

It's much the same circuit as the Philips 234 by the look of it, and indeed the control is more like an R.F. Gain pot than a true volume control

26th Aug 2019, 7:49 pm	#1
trabant Retired Dormant Member Join Date: Mar 2010 Location: Carlisle, UK. Posts: 164	Philips 834A volume pot Does anyone know the correct value and wattage of the volume pot for this set?

26th Aug 2019, 9:10 pm	#2
Nanozeugma Heptode Join Date: Nov 2017 Location: London, UK. Bury, Lancashire quite regularly :) Posts: 611	Re: Philips 834A volume pot From the Philips service sheet, the volume control appears to comprise R1, R15 and R18 which are given as 1200, 300 and 330 ohms respectively. This thread in a German forum gives an image of the device (scroll down) and some idea of the complexity. https://radio-bastler.de/forum/showthread.php?tid=10661 __________________ Thermionic Emission, warms the cockles of your tubes.

26th Aug 2019, 9:41 pm	#3
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,571	Re: Philips 834A volume pot It's basically a tapped wirewound pot. Ben_Dijkman who is a member of these forums used to supply new inserts for these pots. He may have some left. Look him up in the member section and send him a PM him with the model number of the set and the values of the pot (there are different types). __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman..... Last edited by Sideband; 26th Aug 2019 at 9:46 pm.

4th Nov 2019, 12:11 pm	#4
telstar Octode Join Date: Dec 2003 Location: Leeds, West Yorkshire, UK. Posts: 1,592	Re: Philips 834A volume pot Ben supplied me with one of these controls many years back. It is not in the audio stages of the radio, but in the "front end". Not sure if it is true or not, but someone told me once that these devices could be replaced by other components (can not think of how that could be achieved)?

4th Nov 2019, 1:33 pm	#5
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Philips 834A volume pot It's much the same circuit as the Philips 234 by the look of it, and indeed the control is more like an R.F. Gain pot than a true volume control