Brenell MK5 M Series3 - UK Vintage Radio Repair and Restoration Discussion Forum

MikeCross · 24th Oct 2019, 11:53 am

I have just acquired the above machine and roughly it works.

The electronics is a little noisy but the main problem is the suppressor units
connected across the deck switching.
The takeup motor revolves slowly when the deck is at idle showing leakage..

Can anyone recommend a suitable component to replace these suppressors.

The Brenell manual has no information at all.

Thanks

barrymagrec · 24th Oct 2019, 1:54 pm

I have just looked at a series 1 deck and they appear to be 0.01uf in series with 220 ohms in an encapsulated block, I doubt the values are critical but the cap needs to be mains rated, obviously.

We used to use a similar block with values of 0.1uf and 100ohms, they packed up frequently, I once had a weekend trip to Dusseldorf to fix a continual running spool motor and diagnosed the problem in 30 seconds.

On another occasion the suppressor was connected to earth and when it failed it took out the breaker for the entire electricity supply to the basement studio (no Windows).

Farnell do various types :-

https://uk.farnell.com/c/passive-com...-sup-saf-cap_7

24th Oct 2019, 11:53 am	#1
MikeCross Tetrode Join Date: Sep 2016 Location: Tring, Hertfordshire, UK. Posts: 87	Brenell MK5 M Series3 I have just acquired the above machine and roughly it works. The electronics is a little noisy but the main problem is the suppressor units connected across the deck switching. The takeup motor revolves slowly when the deck is at idle showing leakage.. Can anyone recommend a suitable component to replace these suppressors. The Brenell manual has no information at all. Thanks

24th Oct 2019, 1:54 pm	#2
barrymagrec Octode Join Date: Dec 2017 Location: Morden, Surrey, UK. Posts: 1,557	Re: Brenell MK5 M Series3 I have just looked at a series 1 deck and they appear to be 0.01uf in series with 220 ohms in an encapsulated block, I doubt the values are critical but the cap needs to be mains rated, obviously. We used to use a similar block with values of 0.1uf and 100ohms, they packed up frequently, I once had a weekend trip to Dusseldorf to fix a continual running spool motor and diagnosed the problem in 30 seconds. On another occasion the suppressor was connected to earth and when it failed it took out the breaker for the entire electricity supply to the basement studio (no Windows). Farnell do various types :- https://uk.farnell.com/c/passive-com...-sup-saf-cap_7 Last edited by barrymagrec; 24th Oct 2019 at 2:08 pm. Reason: link added