Hi All, I have some noob questions and would greatly appreciate any help/answers to my questions.
1. I purchased a bunch of resistors (carbon comp.) and capacitors about 15 years ago but have not used them as yet to upgrade my Heathkit AA-121 tube power amplifier. I am now planning to do the upgrade and was wondering if it would be okay for me to use those NOS parts (which have been sitting in my basement for the past 15 years) and save money in the bargain, or whether it would be wiser to just dump those and purchase a whole new set (of metal film resistors, to replace the c/c ones)? The amp was completely taken apart in order to repaint the chassis.
2. In the first picture, what is the blue-circled component? Is it a wirewound resistor? The rating on the component is 22K +/-1%, but the manual parts list states that those should be 22K ohm 1 Watt Matched resistors (red-red-orange). Perhaps the previous owner changed those parts? Is there any significance of getting matched resistors?
And what about the red-circled component? Is that just a tubular capacitor, .047 mfd @ 600 volts?
3. With regards to the second picture, are the red-circled and blue-circled components also wirewound resistors?
If all of these are indeed wirewound resistors, where could I purchase them from, and what should I be searching for?
Thanks.
CR
1. I purchased a bunch of resistors (carbon comp.) and capacitors about 15 years ago but have not used them as yet to upgrade my Heathkit AA-121 tube power amplifier. I am now planning to do the upgrade and was wondering if it would be okay for me to use those NOS parts (which have been sitting in my basement for the past 15 years) and save money in the bargain, or whether it would be wiser to just dump those and purchase a whole new set (of metal film resistors, to replace the c/c ones)? The amp was completely taken apart in order to repaint the chassis.
2. In the first picture, what is the blue-circled component? Is it a wirewound resistor? The rating on the component is 22K +/-1%, but the manual parts list states that those should be 22K ohm 1 Watt Matched resistors (red-red-orange). Perhaps the previous owner changed those parts? Is there any significance of getting matched resistors?
And what about the red-circled component? Is that just a tubular capacitor, .047 mfd @ 600 volts?
3. With regards to the second picture, are the red-circled and blue-circled components also wirewound resistors?
If all of these are indeed wirewound resistors, where could I purchase them from, and what should I be searching for?
Thanks.
CR
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I would use metal film, but if the CC resistors measure ok they would work, just not as well.
Observe power ratings.
The 22k appear to be wirewound power resistors. The 1% tolerance qualifies them to be matched.
If these all measure ok, you should not have to replace them, but here are some new listings.
https://www.mouser.com/ProductDetail/Ohmite/43F12RE?qs=Eu7VQysQ4TInYBPXZHhhwg==
https://www.mouser.com/ProductDetail/Vishay-Dale/RS02B22K00FB12
Observe power ratings.
The 22k appear to be wirewound power resistors. The 1% tolerance qualifies them to be matched.
If these all measure ok, you should not have to replace them, but here are some new listings.
https://www.mouser.com/ProductDetail/Ohmite/43F12RE?qs=Eu7VQysQ4TInYBPXZHhhwg==
https://www.mouser.com/ProductDetail/Vishay-Dale/RS02B22K00FB12
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Thanks rayma and Galu!
WRT the second pic...are the black thingies just 6 ohm wirewound resistors? And is the orange-ish thingie a 12 ohm w/w resistor?
WRT the second pic...are the black thingies just 6 ohm wirewound resistors? And is the orange-ish thingie a 12 ohm w/w resistor?