Difference between Mullard 1169 and 1179? - UK Vintage Radio Repair and Restoration Discussion Forum

Andy Day · 26th May 2007, 4:19 pm

Hi folks,

Does anyone know the difference between the Mullard 1169 and 1179 modules, or are they interchangeable?

I need to know if I can put the 1179 from a Roberts R707 into an R600, which normally has a 1169.

Thanks, Andy

Station X · 26th May 2007, 4:59 pm

For what it's worth info on the LP1169 can be found in the attachment to post 3 of this thread:-

https://www.vintage-radio.net/forum/...ullard+modules

Nothing on the LP1179 I'm afraid.

Archivists. Perhaps you could create a "useful info" thread in the components and circuits section containing this data. It's not easy to find with a search

Andy Day · 27th May 2007, 8:35 pm

Thanks Graham, I've been there, got that!

The 1179 looks very similar. I have a spare dud of each, if I get time tomorrow I'll try to pop the tins open and see if they look the same inside.

Andy

Brian R Pateman · 28th May 2007, 5:56 pm

Quote:

Originally Posted by Station X

Archivists. Perhaps you could create a "useful info" thread in the components and circuits section containing this data. It's not easy to find with a search

I'd been thinking along those lines myself - perhaps I'll go there when I've done with Vintage Test Equipment".

Regards,

Herald1360 · 29th May 2007, 10:47 pm

Sorry, can't help with differences but a grey cell twitched and I dug this out of the shed

Apologies for quality- it's a scan of a grotty Xerox (genuine 3600) copy I made sometime in the 70's when I bought one of these beasts from RTVC and had access to the Racal Technical Library at Western Road (now long gone....).

Chris

Herald1360 · 30th May 2007, 9:00 am

Had a bit of a browse of the two datasheets- looks like the LP1179 is negative earth while the LP1169 is positive earth. That sounds logical given that th 1169 is earlier. There seem to be a few detail differences in dimensions but the two should be physically interchangeable providing they have the tuning spindle in the same position. They would NOT be electrically interchangeable!

Chris

Station X · 30th May 2007, 12:22 pm

Well done Chris. This thread is an obvious candidate for useful info.

It's strange that Mulard produced seperate data sheets for the two (six) versions. A single data sheet with a note regarding polarity would have sufficed and made things immediately clear.

26th May 2007, 4:19 pm	#1
Andy Day Pentode Join Date: Aug 2005 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 154	Difference between Mullard 1169 and 1179? Hi folks, Does anyone know the difference between the Mullard 1169 and 1179 modules, or are they interchangeable? I need to know if I can put the 1179 from a Roberts R707 into an R600, which normally has a 1169. Thanks, Andy __________________ The older I get, the faster I was!

26th May 2007, 4:59 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Difference between Mullard 1169 and 1179? For what it's worth info on the LP1169 can be found in the attachment to post 3 of this thread:- https://www.vintage-radio.net/forum/...ullard+modules Nothing on the LP1179 I'm afraid. Archivists. Perhaps you could create a "useful info" thread in the components and circuits section containing this data. It's not easy to find with a search __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

27th May 2007, 8:35 pm	#3
Andy Day Pentode Join Date: Aug 2005 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 154	Re: Difference between Mullard 1169 and 1179? Thanks Graham, I've been there, got that! The 1179 looks very similar. I have a spare dud of each, if I get time tomorrow I'll try to pop the tins open and see if they look the same inside. Andy __________________ The older I get, the faster I was!

29th May 2007, 10:47 pm	#5
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Difference between Mullard 1169 and 1179? Sorry, can't help with differences but a grey cell twitched and I dug this out of the shed Apologies for quality- it's a scan of a grotty Xerox (genuine 3600) copy I made sometime in the 70's when I bought one of these beasts from RTVC and had access to the Racal Technical Library at Western Road (now long gone....). Chris Attached Thumbnails

30th May 2007, 9:00 am	#6
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Difference between Mullard 1169 and 1179? Had a bit of a browse of the two datasheets- looks like the LP1179 is negative earth while the LP1169 is positive earth. That sounds logical given that th 1169 is earlier. There seem to be a few detail differences in dimensions but the two should be physically interchangeable providing they have the tuning spindle in the same position. They would NOT be electrically interchangeable! Chris

30th May 2007, 12:22 pm	#7
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Difference between Mullard 1169 and 1179? Well done Chris. This thread is an obvious candidate for useful info. It's strange that Mulard produced seperate data sheets for the two (six) versions. A single data sheet with a note regarding polarity would have sufficed and made things immediately clear. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.