Pye Transistor when manufactured (Q8) - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

tayjack17 · 2nd Nov 2019, 2:05 am

I am working on a Ferranti PT1104 at this very moment. It has the same circuit board as your Q8? They must have used the same board in quite a few sets.

Your Q8 is in exceptional condition. I think I have one in my collection somewhere. Will have to dig it out

Paul

Nuvistor · 2nd Nov 2019, 8:22 am

If you have to take out the PCB, just a warning about that screw head in the hole in the PCB.

Don’t unscrew it, it secures the magnet in the speaker and nothing to do with the PCB. It was common to get these radios in for repair when someone had tried to remove the PCB and find the speaker ruined.

Refugee · 2nd Nov 2019, 12:49 pm

I thought it was the back end of the tuning cap that had a screw showing on the track side of the board.
I had forgotten about it being the speaker. I never undid it.

Northyorks1 · 2nd Nov 2019, 1:50 pm

Yes Paul I was surprised at its condition, and being such a novice thats why I asked about possible reproductions as it looked like new. Thanks Frank for info on screw, all advice is very much appreciated.

Ian

Nuvistor · 2nd Nov 2019, 2:42 pm

Quote:

Originally Posted by Refugee

I thought it was the back end of the tuning cap that had a screw showing on the track side of the board.
I had forgotten about it being the speaker. I never undid it.

It’s both but I only had problems with some undoing the speaker.

tayjack17 · 2nd Nov 2019, 2:54 pm

Hi
Sent a message yesterday but it looks like it did not get through!!
I am working on a Ferranti PT1104 which looks like it has the same board.

I think I have a Q8 in my collection somewhere. Will have to dig it out.
Ekco seem to have used the same basic PCB for quite a few models.
Most of them seem to come from 1961 to 1963.

Station X · 2nd Nov 2019, 2:59 pm

Have you looked at post #21?

tayjack17 · 2nd Nov 2019, 3:10 pm

Sorry...

Just got round to posting on here. New to the site and how it works.
Am disabled...long story....

Will get better as I go along. Promise...

Paul

Northyorks1 · 5th Nov 2019, 2:04 pm

Started radio and it is working ok. Apart from quite a bit of backround hiss which you can hear more at the end of the video link which is attached, any advice. It is picking up quite a few stations on MW and the volume is very good. It was very crackly and jumpy, so a spray with servisol cleared that up. Other than clean the waveband switch thats all I have done. Just pleased it is working, as my trobleshooting skills are very limited to say the least.

Ian

https://vimeo.com/371120225

Nuvistor · 5th Nov 2019, 2:19 pm

I don’t think that background hiss is the radio, typical MW interference from today’s electronics.
Sounds good, they were never going to be hifi but did the job they were designed for.

Northyorks1 · 5th Nov 2019, 5:07 pm

Think you are right about the interference Frank, Sounds better in different parts of the house. And one of main culprits is laptop adaptor.

Ian

Hybrid tellies · 7th Nov 2019, 1:27 pm

I have the same Pye model stashed away somewhere. If I remember it worked on MW but not LW.But I did notice that it did sound good on our local AM stations.

I have also a Ferranti with no model number but the PCB does looks the same as the Pye Q8 and the Ferranti PT1104. This one works ok on MW but on LW it just picks up MW stations at various points across the band with lots of noise and weaker than on the MW band.
I have not dared take it apart yet as I have heard there can be problems removing the dial and have heard that many a speaker of these has been destroyed by disturbing that screw on the back of the speaker.
I just wondered if anyone could identify the model number so I can download the correct circuit diagram.

AC/HL · 7th Nov 2019, 2:58 pm

Could be the PT1056. There were two versions of the Q8, with or without bias stabilisation or peak performance control in Pye speak. The 1056 appears to be the earlier one. You can tell which by the presence or absence of the seventh transistor, which is diode connected.

Cobaltblue · 7th Nov 2019, 3:00 pm

PT1056?

https://www.radiomuseum.org/r/ferranti_pt1056.html

Cheers

Mike T

Crossed with AC/HL

Hybrid tellies · 8th Nov 2019, 11:21 am

Thanks for your helpful responses. It does look like the PT1056. It only worked on medium wave in Cornwall its sensitivity was ok for a short superhet radio just picking up BBC R4 West region and struggled with Luxembourg at night.
Its interesting to note that it uses the OC transistors I thought all these chassis used the Newmarket range of transistors.
I shall download both circuit diagrams before trying to remove the PCB.

2nd Nov 2019, 8:22 am	#22
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Pye Transistor when manufactured (Q8) If you have to take out the PCB, just a warning about that screw head in the hole in the PCB. Don’t unscrew it, it secures the magnet in the speaker and nothing to do with the PCB. It was common to get these radios in for repair when someone had tried to remove the PCB and find the speaker ruined. __________________ Frank

2nd Nov 2019, 12:49 pm	#23
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: Pye Transistor when manufactured (Q8) I thought it was the back end of the tuning cap that had a screw showing on the track side of the board. I had forgotten about it being the speaker. I never undid it.

2nd Nov 2019, 1:50 pm	#24
Northyorks1 Heptode Join Date: Mar 2018 Location: Saltburn, North Yorkshire, UK. Posts: 623	Re: Pye Transistor when manufactured (Q8) Yes Paul I was surprised at its condition, and being such a novice thats why I asked about possible reproductions as it looked like new. Thanks Frank for info on screw, all advice is very much appreciated. Ian

2nd Nov 2019, 2:54 pm	#26
tayjack17 Diode Join Date: Mar 2018 Location: Manchester, UK. Posts: 4	Re: Pye Transistor when manufactured (Q8) Hi Sent a message yesterday but it looks like it did not get through!! I am working on a Ferranti PT1104 which looks like it has the same board. I think I have a Q8 in my collection somewhere. Will have to dig it out. Ekco seem to have used the same basic PCB for quite a few models. Most of them seem to come from 1961 to 1963. Attached Thumbnails

2nd Nov 2019, 2:59 pm	#27
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Pye Transistor when manufactured (Q8) Have you looked at post #21? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

2nd Nov 2019, 2:05 am	#21
tayjack17 Diode Join Date: Mar 2018 Location: Manchester, UK. Posts: 4	Re: Pye Transistor when manufactured (Q8) I am working on a Ferranti PT1104 at this very moment. It has the same circuit board as your Q8? They must have used the same board in quite a few sets. Your Q8 is in exceptional condition. I think I have one in my collection somewhere. Will have to dig it out Paul Attached Thumbnails

2nd Nov 2019, 3:10 pm	#28
tayjack17 Diode Join Date: Mar 2018 Location: Manchester, UK. Posts: 4	Re: Pye Transistor when manufactured (Q8) Sorry... Just got round to posting on here. New to the site and how it works. Am disabled...long story.... Will get better as I go along. Promise... Paul

5th Nov 2019, 2:04 pm	#29
Northyorks1 Heptode Join Date: Mar 2018 Location: Saltburn, North Yorkshire, UK. Posts: 623	Re: Pye Transistor when manufactured (Q8) Started radio and it is working ok. Apart from quite a bit of backround hiss which you can hear more at the end of the video link which is attached, any advice. It is picking up quite a few stations on MW and the volume is very good. It was very crackly and jumpy, so a spray with servisol cleared that up. Other than clean the waveband switch thats all I have done. Just pleased it is working, as my trobleshooting skills are very limited to say the least. Ian https://vimeo.com/371120225 Attached Thumbnails

5th Nov 2019, 2:19 pm	#30
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Pye Transistor when manufactured (Q8) I don’t think that background hiss is the radio, typical MW interference from today’s electronics. Sounds good, they were never going to be hifi but did the job they were designed for. __________________ Frank

5th Nov 2019, 5:07 pm	#31
Northyorks1 Heptode Join Date: Mar 2018 Location: Saltburn, North Yorkshire, UK. Posts: 623	Re: Pye Transistor when manufactured (Q8) Think you are right about the interference Frank, Sounds better in different parts of the house. And one of main culprits is laptop adaptor. Ian

7th Nov 2019, 1:27 pm	#32
Hybrid tellies Nonode Join Date: Jan 2004 Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area. Posts: 2,965	Re: Pye Transistor when manufactured (Q8) I have the same Pye model stashed away somewhere. If I remember it worked on MW but not LW.But I did notice that it did sound good on our local AM stations. I have also a Ferranti with no model number but the PCB does looks the same as the Pye Q8 and the Ferranti PT1104. This one works ok on MW but on LW it just picks up MW stations at various points across the band with lots of noise and weaker than on the MW band. I have not dared take it apart yet as I have heard there can be problems removing the dial and have heard that many a speaker of these has been destroyed by disturbing that screw on the back of the speaker. I just wondered if anyone could identify the model number so I can download the correct circuit diagram. Attached Thumbnails __________________ Simon BVWS member Last edited by Hybrid tellies; 7th Nov 2019 at 1:36 pm.

7th Nov 2019, 2:58 pm	#33
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Pye Transistor when manufactured (Q8) Could be the PT1056. There were two versions of the Q8, with or without bias stabilisation or peak performance control in Pye speak. The 1056 appears to be the earlier one. You can tell which by the presence or absence of the seventh transistor, which is diode connected.

7th Nov 2019, 3:00 pm	#34
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,865	Re: Pye Transistor when manufactured (Q8) PT1056? https://www.radiomuseum.org/r/ferranti_pt1056.html Cheers Mike T Crossed with AC/HL __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk Last edited by Cobaltblue; 7th Nov 2019 at 3:01 pm. Reason: Crossed

8th Nov 2019, 11:21 am	#35
Hybrid tellies Nonode Join Date: Jan 2004 Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area. Posts: 2,965	Re: Pye Transistor when manufactured (Q8) Thanks for your helpful responses. It does look like the PT1056. It only worked on medium wave in Cornwall its sensitivity was ok for a short superhet radio just picking up BBC R4 West region and struggled with Luxembourg at night. Its interesting to note that it uses the OC transistors I thought all these chassis used the Newmarket range of transistors. I shall download both circuit diagrams before trying to remove the PCB. __________________ Simon BVWS member