Pye v4 - Page 14 - UK Vintage Radio Repair and Restoration Discussion Forum

oldticktock · 5th May 2010, 2:30 pm

84.6

murphyv310 · 5th May 2010, 2:34 pm

OK so its not C101! Where is C101 fitted on your set?

oldticktock · 5th May 2010, 2:36 pm

Top mount can wires under chassis near on/off.

Gotta go back in 1 hour

murphyv310 · 5th May 2010, 2:37 pm

Thanks OTT.
I'll need to sign off now and wond be back in till after 7pm but will help you then unless youv'e cracked it.
Good luck

PJL · 5th May 2010, 3:34 pm

Are you reading 84 ohms on the tag of C101 to chassis even when the wire has been snipped off it?

oldticktock · 5th May 2010, 3:54 pm

Ok I'm back

I had already replaced two caps around V1 and V3 as they had crumbled, they are te yellow wima.003's.

I'm looking for the sausage shaped caps C14 etc in that area and for the life of me I cannot find them. All that seems to be down amongst the components are these flat disc shaped caps, I cannot read them at a guess I imagine these might be the ones?

see pic1 of the section in question (V1/V3), the other pic just show state of play so far. I'm not wasting my best caps on this set.

oldticktock · 5th May 2010, 3:56 pm

PJL

answer to #265 = no

PJL · 5th May 2010, 4:29 pm

#265 Good, that would have been a pain.

As you have identified, C14 is the next likely candidate. It should be connected to pin 8 of V1 but I can't see it! Follow the wire back from pin 8 and see where it goes.

oldticktock · 5th May 2010, 4:46 pm

I will have to wait until Trevor gets back and looks at his set as I cannot identify C14 it should be

working back from C18......R17(47R)......C14....R15(150R)

I follow c18 onto r17 that hits a tag strip point, theres a pink wire which from this point flys down to another tag strip which has r15, No C14

Edit:

Glad i'm not the only one who cannot see it

PJL · 5th May 2010, 4:46 pm

Can you measure the resistance to the chassis from either side of R17, the 47 ohm which runs next to the electrolytics. This will indicate which side the fault is...

oldticktock · 5th May 2010, 4:49 pm

V1 pin8....pink wire......R17........

oldticktock · 5th May 2010, 4:52 pm

84R on the C18 side / 136R on the other

Boom · 5th May 2010, 4:55 pm

C23 and C75 might just be worth a look at

Dave

PJL · 5th May 2010, 4:57 pm

So the problem is on the C18 side so we can ignore the missing C14. Try snipping out C75.

oldticktock · 5th May 2010, 4:58 pm

C23...... that's the other sucker i've had trouble finding, in theory it should be down from R131 and to the right a bit. Nope

PJL · 5th May 2010, 4:59 pm

Easier still, just neasure the resistance of C75 and C23.

C23 should be connected to V4 pin 8 but again I can't see it. Do check there are no accidental shorts to the screening.

oldticktock · 5th May 2010, 5:06 pm

I think whoever built this did not use normal caps as shown on the trader, I think these disks are the ones as C75 is not where it's supposed to be.

I will try and figure it out by following out of V15...L30...C75

Boom · 5th May 2010, 5:15 pm

Meter from V15 (pin 7) to chassis will be the same thing as measuring C75 for a short.

PJL · 5th May 2010, 5:16 pm

It is possible the short is in the valve holder or the valve. Try measuring resistance to chassis of:
V4 pin 8
V5 pin 8
V15 pin 7

oldticktock · 5th May 2010, 5:18 pm

how an earth i'm expected to solder down in there is beyond me. How did they build this, Ahhh Steve P's Tinkerbell

close up's of V15 where C75 is supposed to be another 0.003 around V1 there were Hunts which were easy to identify. I wonder if someone has been at this before me

5th May 2010, 2:30 pm	#261
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 84.6

5th May 2010, 2:34 pm	#262
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: Pye v4 OK so its not C101! Where is C101 fitted on your set? __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

5th May 2010, 2:36 pm	#263
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 Top mount can wires under chassis near on/off. Gotta go back in 1 hour

5th May 2010, 2:37 pm	#264
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: Pye v4 Thanks OTT. I'll need to sign off now and wond be back in till after 7pm but will help you then unless youv'e cracked it. Good luck __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

5th May 2010, 3:34 pm	#265
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pye v4 Are you reading 84 ohms on the tag of C101 to chassis even when the wire has been snipped off it? Last edited by PJL; 5th May 2010 at 3:40 pm.

5th May 2010, 3:54 pm	#266
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 Ok I'm back I had already replaced two caps around V1 and V3 as they had crumbled, they are te yellow wima.003's. I'm looking for the sausage shaped caps C14 etc in that area and for the life of me I cannot find them. All that seems to be down amongst the components are these flat disc shaped caps, I cannot read them at a guess I imagine these might be the ones? see pic1 of the section in question (V1/V3), the other pic just show state of play so far. I'm not wasting my best caps on this set. Attached Thumbnails Last edited by oldticktock; 5th May 2010 at 4:14 pm.

5th May 2010, 3:56 pm	#267
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 PJL answer to #265 = no

5th May 2010, 4:29 pm	#268
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pye v4 #265 Good, that would have been a pain. As you have identified, C14 is the next likely candidate. It should be connected to pin 8 of V1 but I can't see it! Follow the wire back from pin 8 and see where it goes. Last edited by PJL; 5th May 2010 at 4:38 pm.

5th May 2010, 4:46 pm	#269
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 I will have to wait until Trevor gets back and looks at his set as I cannot identify C14 it should be working back from C18......R17(47R)......C14....R15(150R) I follow c18 onto r17 that hits a tag strip point, theres a pink wire which from this point flys down to another tag strip which has r15, No C14 Edit: Glad i'm not the only one who cannot see it

5th May 2010, 4:46 pm	#270
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pye v4 Can you measure the resistance to the chassis from either side of R17, the 47 ohm which runs next to the electrolytics. This will indicate which side the fault is...

5th May 2010, 4:49 pm	#271
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 V1 pin8....pink wire......R17........

5th May 2010, 4:52 pm	#272
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 84R on the C18 side / 136R on the other

5th May 2010, 4:55 pm	#273
Boom Retired Dormant Member Join Date: Jan 2007 Location: Westbury, Wiltshire, UK. Posts: 2,451	Re: Pye v4 C23 and C75 might just be worth a look at Dave

5th May 2010, 4:57 pm	#274
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pye v4 So the problem is on the C18 side so we can ignore the missing C14. Try snipping out C75.

5th May 2010, 4:58 pm	#275
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 C23...... that's the other sucker i've had trouble finding, in theory it should be down from R131 and to the right a bit. Nope

5th May 2010, 4:59 pm	#276
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pye v4 Easier still, just neasure the resistance of C75 and C23. C23 should be connected to V4 pin 8 but again I can't see it. Do check there are no accidental shorts to the screening. Last edited by PJL; 5th May 2010 at 5:04 pm.

5th May 2010, 5:06 pm	#277
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 I think whoever built this did not use normal caps as shown on the trader, I think these disks are the ones as C75 is not where it's supposed to be. I will try and figure it out by following out of V15...L30...C75

5th May 2010, 5:15 pm	#278
Boom Retired Dormant Member Join Date: Jan 2007 Location: Westbury, Wiltshire, UK. Posts: 2,451	Re: Pye v4 Meter from V15 (pin 7) to chassis will be the same thing as measuring C75 for a short.

5th May 2010, 5:16 pm	#279
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Pye v4 It is possible the short is in the valve holder or the valve. Try measuring resistance to chassis of: V4 pin 8 V5 pin 8 V15 pin 7

5th May 2010, 5:18 pm	#280
oldticktock Retired Dormant Member Join Date: Nov 2009 Location: Weardale, UK. Posts: 1,981	Re: Pye v4 how an earth i'm expected to solder down in there is beyond me. How did they build this, Ahhh Steve P's Tinkerbell close up's of V15 where C75 is supposed to be another 0.003 around V1 there were Hunts which were easy to identify. I wonder if someone has been at this before me Attached Thumbnails