Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on January 14, 2022, 01:35:12 pm
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I know this has been asked many times but i'm still not confident. I am about to build a 1987 clone and i have a stockpile of 1 Watt Metal Film Resistors (1% Blue ones). Almost every build i have come across uses Carbon Film resistors (brown) and i have yet to see a board populated with Metal Film (the blue ones). I am not set on vintage reproduction i just want to build a good amp with low noise. Thoughts?
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1000's of amps use 1/2 watt metal film resistors
Carbon film are tan, not brown
Carbon comp are brown
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I prefer metal. If I had a stockpile of 1 watters, I would not hesitate to use them.
Here are a couple of examples of my boards loaded with metal. The little blues are 1/2W metal film from Hoffman. The big blues are 3W metal oxide from Hoffman. The big grays are 2W metal oxide from AES.
http://sluckeyamps.com/phoenix/p11_big.jpg
http://sluckeyamps.com/supro/supro_02_big.jpg
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You want low (resistor) noise, go with the metal films you have. Read this: https://www.aikenamps.com/index.php/resistor-types-does-it-matter
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Joe in addition to the above comments, I've been using metal film resistors for years.. and have even started to use the 1/2w variety but have to use high mag reader glasses to see them.. they are quite small and that may be why many people like myself use the 1w variety, much easier to read the bands (see). Also if you are replacing plate resistors in vintage amps the 1w will be appx the same size as the 1/2w carbon composition which to me looks better, of course some like to replace them with carbon comps to maintain originality. I don't worry much about it myself.