Unknown Component (A fuse) - UK Vintage Radio Repair and Restoration Discussion Forum

Bookman · 12th Dec 2017, 11:23 am

Just started looking at a Perpetuum-Ebner HSV 20T amp I bought from a website. It was advertised as no output on one channel but I was keen to buy it to complement my PE 2020 deck.
A general overview reveals a bit of untidy soldering but also a component I am not familiar with. It is connected in series with the output speaker connection and is extremely small measuring 8mm long x 4mm dia. It reads zero ohms.
There is one missing so there will obviously be no output on one channel but I am loathed to just short the terminal to test? Does anyone know what it is? I don't have any diagrams but would assume it is some form or current limiting device.
I would also ask if anyone can provide an ordering description for the silver coloured possible capacitor shown in the DC supply circuit. It is labelled FRAKO W. Germany + 100/35 (HH) only it has white powder at one terminal.
Last but not least are the O/P Transistors which are VALVO AD139 the status of which is unknown at this time.
In the event all is not well can anyone advise recommended supplier or possible better replacements for consideration.
Thanking you all in advance I remain forever thankful.
Joe

ms660 · 12th Dec 2017, 11:37 am

Fuses....1.5 amp according to the manual, manual available from elektrotanya.

Lawrence.

Ted Kendall · 12th Dec 2017, 11:38 am

The capacitor is a 100uF/35v electrolytic, and, as you note, is duff. Replacements are readily available. The plug-in thing is probably a simple fuse - could conceivably be an inductor, but I can't see why that would be made a plug-in.

McMurdo · 12th Dec 2017, 12:09 pm

http://www.littelfuse.com/products/f...fuses/262.aspx

'LIVEWIRE?' · 12th Dec 2017, 12:49 pm

I almost if not quite, treat Frako Electrolytics as 'replace on sight, having some time ago found two of their Radial Electrolytics to be short circuit in the same 1980s Blaupunkt Car Stereo. Those fuses (or similar types) are often encountered in continental equipment, but usually in items using printed circuit boards

dazzlevision · 12th Dec 2017, 4:16 pm

The plug in fuse was made by Wickmann of Germany (now owned by Littlefuse of the USA, since 2006). Their logo (shown in your close up photo) is based on the letter "W".

Bookman · 12th Dec 2017, 4:42 pm

Quote:

Originally Posted by McMurdo

http://www.littelfuse.com/products/f...fuses/262.aspx

Well Kev I am dumfounded as I never knew fuses were made that small and at such ratings. I wonder what they use for the fuse element; probably a slither of solder perhaps?
But hey, ultra many thanks for the link and compliments for the season.
Joe

'LIVEWIRE?' · 15th Dec 2017, 11:34 pm

Following on from my comments in post #5, earlier today I was checking a Motorola 114 Car Radio. This 1970s UK made AM set uses 4 Frako Electrolytics, and as the fault was 'no reception, I suspected, and was proved right, that one of the Frako caps was faulty - indeed C14 (400uf) which decouples the supply to the RF/IF stages was virtually short-circuit, so that has been replaced with a nodern 470u 16v. The others will also be replaced as a precaution! Motto; Always at least suspect Frako Electrolytics, preferably replace them!

12th Dec 2017, 11:23 am	#1
Bookman Hexode Join Date: Aug 2017 Location: Taunton, Somerset, UK. Posts: 318	Unknown Component (A fuse) Just started looking at a Perpetuum-Ebner HSV 20T amp I bought from a website. It was advertised as no output on one channel but I was keen to buy it to complement my PE 2020 deck. A general overview reveals a bit of untidy soldering but also a component I am not familiar with. It is connected in series with the output speaker connection and is extremely small measuring 8mm long x 4mm dia. It reads zero ohms. There is one missing so there will obviously be no output on one channel but I am loathed to just short the terminal to test? Does anyone know what it is? I don't have any diagrams but would assume it is some form or current limiting device. I would also ask if anyone can provide an ordering description for the silver coloured possible capacitor shown in the DC supply circuit. It is labelled FRAKO W. Germany + 100/35 (HH) only it has white powder at one terminal. Last but not least are the O/P Transistors which are VALVO AD139 the status of which is unknown at this time. In the event all is not well can anyone advise recommended supplier or possible better replacements for consideration. Thanking you all in advance I remain forever thankful. Joe Attached Thumbnails

12th Dec 2017, 11:37 am	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Unknown Component Fuses....1.5 amp according to the manual, manual available from elektrotanya. Lawrence.

12th Dec 2017, 11:38 am	#3
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,675	Re: Unknown Component The capacitor is a 100uF/35v electrolytic, and, as you note, is duff. Replacements are readily available. The plug-in thing is probably a simple fuse - could conceivably be an inductor, but I can't see why that would be made a plug-in.

12th Dec 2017, 12:09 pm	#4
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,274	Re: Unknown Component http://www.littelfuse.com/products/f...fuses/262.aspx __________________ Kevin

12th Dec 2017, 4:16 pm	#6
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,621	Re: Unknown Component The plug in fuse was made by Wickmann of Germany (now owned by Littlefuse of the USA, since 2006). Their logo (shown in your close up photo) is based on the letter "W".

12th Dec 2017, 12:49 pm	#5
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Unknown Component I almost if not quite, treat Frako Electrolytics as 'replace on sight, having some time ago found two of their Radial Electrolytics to be short circuit in the same 1980s Blaupunkt Car Stereo. Those fuses (or similar types) are often encountered in continental equipment, but usually in items using printed circuit boards

15th Dec 2017, 11:34 pm	#8
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Unknown Component Following on from my comments in post #5, earlier today I was checking a Motorola 114 Car Radio. This 1970s UK made AM set uses 4 Frako Electrolytics, and as the fault was 'no reception, I suspected, and was proved right, that one of the Frako caps was faulty - indeed C14 (400uf) which decouples the supply to the RF/IF stages was virtually short-circuit, so that has been replaced with a nodern 470u 16v. The others will also be replaced as a precaution! Motto; Always at least suspect Frako Electrolytics, preferably replace them!