Tube Radio Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Resistor sizes

+2
Bill Cahill
Rickey
6 posters

Go down

Resistor sizes Empty Resistor sizes

Post by Rickey Sat Oct 22, 2011 6:47 am

I ordered some resistors from Mouser, and some of the resistors say 1 watt on the package, but they are only half as big. Did I get half watts by mistake? They are metal film.
Thanks
Rickey
Rickey
Member
Member

Number of posts : 57
Age : 66
Registration date : 2011-09-06

Back to top Go down

Resistor sizes Empty Re: Resistor sizes

Post by Bill Cahill Sat Oct 22, 2011 8:59 am

The new resistors tend to be smaller in size than original old ones.
Bill Cahill

_________________
Please also join us here; www.videokarma.org/index.php
Bill Cahill
Bill Cahill
Admin
Admin

Number of posts : 4432
Age : 70
Registration date : 2008-03-12

Back to top Go down

Resistor sizes Empty Re: Resistor sizes

Post by jukeboxman Fri Nov 04, 2011 9:53 pm

I agree I just got a bunch of half watt carbon film and was shocked at how small they were.
Gary
jukeboxman
jukeboxman
Admin
Admin

Number of posts : 204
Age : 68
Registration date : 2011-11-04

Back to top Go down

Resistor sizes Empty Re: Resistor sizes

Post by sprman Sat Nov 05, 2011 3:11 pm

Now days they are much better made even tho they are smaller.Caps are same way.Tho better and smaller i wonder if they get rid of heat beter..Sprman : )

sprman
Member
Member

Number of posts : 323
Age : 66
Registration date : 2008-03-27

Back to top Go down

Resistor sizes Empty Re: Resistor sizes

Post by Fred Longworth Tue Mar 20, 2012 12:43 am

I think the tinier metal films are simply capable of running a lot hotter without degradation.

They also have a really good noise figure. I order from Mouser at least once a week.

Fred
owner of Classic Audio Repair in San Diego

Fred Longworth
New Member
New Member

Number of posts : 7
Registration date : 2012-03-11

Back to top Go down

Resistor sizes Empty Re: Resistor sizes

Post by Leigh Tue Oct 09, 2012 5:10 am

Fred Longworth wrote:I think the tinier metal films are simply capable of running a lot hotter without degradation.
Exactly. Resistor power ratings are based on the highest temperature the part can stand without problems.
Modern parts can take higher temperatures.

On the subject of ratings, be aware that resistors have voltage ratings, just like capacitors.

Regular 1/4-watt carbon composition resistors are rated 250 volts, and thus are questionable for use in tube radios.
Standard 1/2-watt carbon comps are rated 350 volts, while 1-watt and 2-watt parts are rated 450 volts.
Be sure to choose replacement parts with an appropriate voltage ratings. I only stock 1-watt or 2-watt parts.

- Leigh

Leigh
Member
Member

Number of posts : 22
Registration date : 2012-10-09

Back to top Go down

Resistor sizes Empty Re: Resistor sizes

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum