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FDP Forum / Fender Amps: Vintage (before 1985) / 1/2W Metal Film physical size

roadhog96

USA / Sesame St.

May 5th, 2017 10:05 AM   Edit   Profile   Print Topic   Search Topic

Anyone ever use miniature Metal Film resistors in a Fender amp? Theres a little difference in the phyiscal size comparred to other Metal Film I've seen even though they are the same rating.

The 1/2W metal Film I have on hand look a little smaller than the original CC composition that Fender used but were advertised as "miniature" Metal Film are normally smaller than CC on comparrison

I've read were the mini's have transfered heat down the leads, causing damage to PCB boards and even crystalized the solder. I dont think that would be an issue on a old Fender, there is no PCB board and there's a larger solder mass and eyelet to help disapate heat than those tiny solder joints on PCB's.

Any down side to using them that you know of?

(This message was last edited by roadhog96 at 01:47 PM, May 5th, 2017)

roadhog96

USA / Sesame St.

May 6th, 2017 06:27 PM   Edit   Profile   Print Topic   Search Topic

Here's a comparrison of two Metal Film resistors, see the difference in size. Both rated at 1/2W 100K. I tried these Mini resistors in an amp for the plate load replacements and besides the amp being extremly quite, I'm not seeing any problems using these. This is why I'm curious if anyone else has tried or uses these. I'm going to try and take some temperature readings just to see what gives.

Upon some more searching It seems that the size of the mini is more common than I thought. I checked a few venders and compared the dimensions of their metal film and they are all about this size. They must have figured out a way to make them smaller than they use to be and get the same results.

Regular vs. Mini Comparison

(This message was last edited by roadhog96 at 10:58 PM, May 6th, 2017)

Steve Dallman
Contributing Member
**********

Merrill, Wisconsin

Age is just a number...mine is big
May 7th, 2017 08:25 AM   Edit   Profile   Print Topic   Search Topic

Metal oxide are larger than metal film. The one on the left looks like metal oxide (as quiet as film in my experience.)

From my failing memory, I seem to remember the voltage ratings of carbon comp/film resistors were higher than the voltage ratings of the same wattage metal film/oxide resistors. This was some time ago, so don't make book on my memory.

AND since higher wattage resistors are usually quieter than lower, I have always gone higher in wattage for plate resistors. I usually use 1 watt or higher. I bought a bunch of 3 watt 100k metal oxide resistors cheap some years ago and still have some left so haven't gotten around to using anything else for a long time.

roadhog96

USA / Sesame St.

May 7th, 2017 09:13 AM   Edit   Profile   Print Topic   Search Topic

I was told by the previous owner that all metal film was used in the amp. Your probably right about it being metal oxide, it doesn't look as shiny as metal film.

It's funny you should mention about higher wattage resistors being quieter, I was just reading about that same subject. It probably would be real noticable with CC but the 1/2W metal film seem very quite so I'm not sure if it would make much of a difference that I can hear but I suppose it wouldnt hurt to try.

I did do a Voltage rating comparisons between the different types and they were all the same. I'm sure there are some manufactures that I didn't check that would challange my findings.

(This message was last edited by roadhog96 at 04:58 PM, May 7th, 2017)

FDP Forum / Fender Amps: Vintage (before 1985) / 1/2W Metal Film physical size




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