R1155 Power Supply - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

G4YVM David · 9th Jun 2014, 2:40 pm

The 6v6 tests as open circuit on the heater.

As luck would have it, I have another 6v6 hiding in a scrap WS19 set which I'd forgotten about. That heater tests okay so Ive popped it in.

On thinking about it though, I could probably find the valves needed for my tx also inside the 19set!

And everything else...the 19 set itself will never work again anyway...but the valves might.

David

AC/HL · 9th Jun 2014, 3:57 pm

Try re-soldering the heater pins of the valve itself, it sometimes works.

turretslug · 9th Jun 2014, 10:27 pm

It certainly did just the other day with a disappointingly cold 5Z4GT, the envelope wasn't even wobbly in the base. It's common to find just a tiny amount of solder at the end of the hollow pin making contact with the lead-out wire, it wouldn't surprise me if dry-jointing here was fairly common.

G4VYM David, how does the PSU chassis AC voltage look now that you've bumped the input up a bit, is the PSU metalwork earthed? Whilst the output negative side needs to be isolated from chassis in order that the R1155 bias voltages can be developed across the resistor between -ve supply and receiver chassis, the PSU chassis still ought to be connected to mains input earth for safety.

Re. variacs and valve rectifiers, it's considered that running rectifier filaments/heaters at somewhat lower than nominal voltage (ie. low cathode temperature) can be harmful for the cathode, especially if HT current is drawn.

G4YVM David · 9th Jun 2014, 11:18 pm

Thanks guys.

I have finished the variac treatment now and the PSU has come to life exactly as G3COY made it. The output (fed to a valve octal base) shows correct HT and LT Volts.

I need a plug to fit the octal (which I think DM Smalls in Salisbury sells...he certainly sells MANY valves!) and then attach the power to my 1155. I'm tantalisingly close to hearing my 1155! Assuming it works as promised of course! At the very least, Ive got a power supply.

The only Jones plug I have has no cover...I guess I can either fabricate a cover or buy a new plug...think I'll try fabrication!

David

Herald1360 · 10th Jun 2014, 12:13 am

Heatshrink on each pin and some tape round the lot will keep things safe until a more aesthetic solution is found

Even a bit of paxolin or fibreglass board on some pillars to stop casual contact would do.

Back in the days, mine just had wires soldered to the pins on the receiver

G4YVM David · 10th Jun 2014, 12:58 pm

Thanks Chris.

Next search is for the octal plug!! My hope in Smalls of Salisbury drew a blank, so it's off to ebay for me now!!

I think the items known as "Bulgin octal plugs" are what I want, is this correct?

David

TrevorG3VLF · 12th Jun 2014, 10:38 pm

If you have a dead 6V6 don't you have a plug?

G4YVM David · 13th Jun 2014, 7:18 am

Trevor...

ah ha! Yes indeed. Lateral thinking!

I fact a friend has offered one and as I haven't been in the workshop much I the last few days I hadn't considered the problem much. But you are right. Been staring me in the face! !

David

G4YVM David · 16th Jun 2014, 7:14 am

Well I've hooked up my psu but the LT which is present within the unit isn't making it into the rx. No, not bad wiring.

I've fixed up a friend s psu and that's not putting LT out either.
I wondering whether there's a "trick" to the LT. I assume that the LT is going to show on a digital volt meter across the terminals and the "above ground" thing won't be fooling me.

It seems strange that both LT are down. Either way, there is some life in the rx but no heaters are glowing so nothing yet to get excited over

d

G4YVM David · 16th Jun 2014, 4:19 pm

PSU working again.

Receiver NOT

Keith · 17th Jun 2014, 8:58 pm

If on P1 (exteme right connector) you've got 6V connected to pin 3 w.r.t pin 4 (aka chassis) the heaters should light up. If not, either all the heaters are blown (unlikely) or you've got a dodgy connection somewhere.

James Duncan · 23rd Jun 2014, 8:02 pm

Dont forget that the R1155 chassis is NOT DC neg the volts between DC neg and chassis is the bias.check your circuit drawings.

cheers
MM0HDW

M0FYA Andy · 23rd Jun 2014, 8:28 pm

See my post number 11.

Andy

Keith · 23rd Jun 2014, 8:45 pm

Quote:

Originally Posted by James Duncan

Dont forget that the R1155 chassis is NOT DC neg the volts between DC neg and chassis is the bias.check your circuit drawings.

True for the HT but not for LT. David's last post indicated that the heaters were not glowing. I wonder if he has the LT return going to the same pin as the HT negative rather than to pin 4 (chassis).

G4YVM David · 24th Jun 2014, 2:09 pm

Dunno yet...things taken a back seat for a variety of reasons including building a k2.

Have been to play with a friends 1155 / 1154 sets though.

D

9th Jun 2014, 2:40 pm	#21
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 power and 10 amp jacks? The 6v6 tests as open circuit on the heater. As luck would have it, I have another 6v6 hiding in a scrap WS19 set which I'd forgotten about. That heater tests okay so Ive popped it in. On thinking about it though, I could probably find the valves needed for my tx also inside the 19set! And everything else...the 19 set itself will never work again anyway...but the valves might. David

9th Jun 2014, 3:57 pm	#22
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: R1155 Power Supply Try re-soldering the heater pins of the valve itself, it sometimes works.

9th Jun 2014, 10:27 pm	#23
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,398	Re: R1155 Power Supply It certainly did just the other day with a disappointingly cold 5Z4GT, the envelope wasn't even wobbly in the base. It's common to find just a tiny amount of solder at the end of the hollow pin making contact with the lead-out wire, it wouldn't surprise me if dry-jointing here was fairly common. G4VYM David, how does the PSU chassis AC voltage look now that you've bumped the input up a bit, is the PSU metalwork earthed? Whilst the output negative side needs to be isolated from chassis in order that the R1155 bias voltages can be developed across the resistor between -ve supply and receiver chassis, the PSU chassis still ought to be connected to mains input earth for safety. Re. variacs and valve rectifiers, it's considered that running rectifier filaments/heaters at somewhat lower than nominal voltage (ie. low cathode temperature) can be harmful for the cathode, especially if HT current is drawn.

9th Jun 2014, 11:18 pm	#24
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 Power Supply Thanks guys. I have finished the variac treatment now and the PSU has come to life exactly as G3COY made it. The output (fed to a valve octal base) shows correct HT and LT Volts. I need a plug to fit the octal (which I think DM Smalls in Salisbury sells...he certainly sells MANY valves!) and then attach the power to my 1155. I'm tantalisingly close to hearing my 1155! Assuming it works as promised of course! At the very least, Ive got a power supply. The only Jones plug I have has no cover...I guess I can either fabricate a cover or buy a new plug...think I'll try fabrication! David

10th Jun 2014, 12:13 am	#25
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: R1155 Power Supply Heatshrink on each pin and some tape round the lot will keep things safe until a more aesthetic solution is found Even a bit of paxolin or fibreglass board on some pillars to stop casual contact would do. Back in the days, mine just had wires soldered to the pins on the receiver __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

10th Jun 2014, 12:58 pm	#26
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 Power Supply Thanks Chris. Next search is for the octal plug!! My hope in Smalls of Salisbury drew a blank, so it's off to ebay for me now!! I think the items known as "Bulgin octal plugs" are what I want, is this correct? David

12th Jun 2014, 10:38 pm	#27
TrevorG3VLF Rest in Peace Join Date: Apr 2011 Location: Matlock, Derbyshire, UK. Posts: 1,378	Re: R1155 Power Supply If you have a dead 6V6 don't you have a plug?

13th Jun 2014, 7:18 am	#28
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 Power Supply Trevor... ah ha! Yes indeed. Lateral thinking! I fact a friend has offered one and as I haven't been in the workshop much I the last few days I hadn't considered the problem much. But you are right. Been staring me in the face! ! David

16th Jun 2014, 7:14 am	#29
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 Power Supply Well I've hooked up my psu but the LT which is present within the unit isn't making it into the rx. No, not bad wiring. I've fixed up a friend s psu and that's not putting LT out either. I wondering whether there's a "trick" to the LT. I assume that the LT is going to show on a digital volt meter across the terminals and the "above ground" thing won't be fooling me. It seems strange that both LT are down. Either way, there is some life in the rx but no heaters are glowing so nothing yet to get excited over d

16th Jun 2014, 4:19 pm	#30
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 Power Supply PSU working again. Receiver NOT

17th Jun 2014, 8:58 pm	#31
Keith Heptode Join Date: Jan 2003 Location: Tewkesbury, Gloucestershire, UK. Posts: 693	Re: R1155 Power Supply If on P1 (exteme right connector) you've got 6V connected to pin 3 w.r.t pin 4 (aka chassis) the heaters should light up. If not, either all the heaters are blown (unlikely) or you've got a dodgy connection somewhere. __________________ Keith Yates - G3XGW VMARS & BVWS member http://www.tibblestone.com/oldradios/Old_Radios.htm

23rd Jun 2014, 8:02 pm	#32
James Duncan Pentode Join Date: May 2010 Location: Wick, Scotland, UK. Posts: 227	Re: R1155 Power Supply Dont forget that the R1155 chassis is NOT DC neg the volts between DC neg and chassis is the bias.check your circuit drawings. cheers MM0HDW

23rd Jun 2014, 8:28 pm	#33
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Re: R1155 Power Supply See my post number 11. Andy

24th Jun 2014, 2:09 pm	#35
G4YVM David Heptode Join Date: May 2014 Location: Salisbury, Wiltshire, UK. Posts: 998	Re: R1155 Power Supply Dunno yet...things taken a back seat for a variety of reasons including building a k2. Have been to play with a friends 1155 / 1154 sets though. D