TRIO R-1000 Display chips; MSM5524RS vs MSM5525RS - UK Vintage Radio Repair and Restoration Discussion Forum

G4_Pete · 3rd Mar 2023, 3:49 pm

Hi,
The MSM5524RS and MSM5525RS display chip types are both mentioned in threads with regards to Trio R-1000 display problems. I have searched around but can not find the difference.

Does anyone know if the above two types are interchangeable as the R-1000 I have here is fitted with the 24RS version but I have a MSM5525RS device here.

Sorry just noticed I got the title wrong and cant change it should be MSM in all cases
Pete

G8UWM-MildMartin · 3rd Mar 2023, 4:06 pm

There is some data at https://worldradiohistory.com/UK/Mis...-Catalog-2.pdf pages 17-23. There is a difference in whether they have stopwatch functions, but I'm at work at the moment and can't have a proper read.

John KC0G · 3rd Mar 2023, 4:30 pm

Martin's reference is where I was also looking. I still have the Ambit catalogues.

The devices are different. The 5524 has a short wave counter option upto 39.999 MHz, with multiplexed digit outputs. You need this feature for the R1000, as it measures the VCO frequency minus 47.6 MHz. The 5525 only has AM and FM displays, with direct segment outputs. And the pinouts are very different.

Upgrades could be internal or external. Google is your friend. Also see https://www.vintage-radio.net/forum/...d.php?t=178068

73 John KC0G/M0KCY

G4_Pete · 3rd Mar 2023, 5:41 pm

Many thanks to you both , quick response . I have the pinouts from the link and yes very different devices.
Thanks Pete

3rd Mar 2023, 3:49 pm	#1
G4_Pete Hexode Join Date: Feb 2014 Location: Southampton, Hampshire, UK. Posts: 419	TRIO R-1000 Display chips; MSM5524RS vs MSM5525RS Hi, The MSM5524RS and MSM5525RS display chip types are both mentioned in threads with regards to Trio R-1000 display problems. I have searched around but can not find the difference. Does anyone know if the above two types are interchangeable as the R-1000 I have here is fitted with the 24RS version but I have a MSM5525RS device here. Sorry just noticed I got the title wrong and cant change it should be MSM in all cases Pete Last edited by Radio Wrangler; 3rd Mar 2023 at 5:07 pm. Reason: Fixed title

3rd Mar 2023, 4:06 pm	#2
G8UWM-MildMartin Heptode Join Date: Jan 2004 Location: Stockport, Greater Manchester, UK. Posts: 827	Re: TRIO R-1000 MSN5524RS vs MSM5525RS There is some data at https://worldradiohistory.com/UK/Mis...-Catalog-2.pdf pages 17-23. There is a difference in whether they have stopwatch functions, but I'm at work at the moment and can't have a proper read.

3rd Mar 2023, 4:30 pm	#3
John KC0G Hexode Join Date: Mar 2009 Location: Minneapolis, Minnesota, USA. Posts: 278	Re: TRIO R-1000 MSN5524RS vs MSM5525RS Martin's reference is where I was also looking. I still have the Ambit catalogues. The devices are different. The 5524 has a short wave counter option upto 39.999 MHz, with multiplexed digit outputs. You need this feature for the R1000, as it measures the VCO frequency minus 47.6 MHz. The 5525 only has AM and FM displays, with direct segment outputs. And the pinouts are very different. Upgrades could be internal or external. Google is your friend. Also see https://www.vintage-radio.net/forum/...d.php?t=178068 73 John KC0G/M0KCY

3rd Mar 2023, 5:41 pm	#4
G4_Pete Hexode Join Date: Feb 2014 Location: Southampton, Hampshire, UK. Posts: 419	Re: TRIO R-1000 Display chips; MSM5524RS vs MSM5525RS Many thanks to you both , quick response . I have the pinouts from the link and yes very different devices. Thanks Pete