GFA-535 bias pot wattage rating? - diyAudio
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Old 16th November 2013, 05:59 PM   #1
delecoy is offline delecoy  United States
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Default GFA-535 bias pot wattage rating?

One of my GFA-535's has a bad bias pot ( VR601 in the service manual ). Being a noob to DIY I have no idea how to calculate the rating. The service manual doesn't list it. I already purchased the only Bourns single turn pots close to the range needed that would fit the space ( Mouser is close, and they were cheap ), but just want to be sure before putting them in. If they're wrong - into the hoard they go.

New ones:

3362F-1-202LF Bourns | Mouser

Old and new ones side by side:

http://i167.photobucket.com/albums/u...35biaspots.jpg
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Old 16th November 2013, 06:07 PM   #2
PKI is offline PKI  United States
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1/4 w would be my guess. These look fine.
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Old 16th November 2013, 06:23 PM   #3
delecoy is offline delecoy  United States
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Thank you much!
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Old 16th November 2013, 07:22 PM   #4
delecoy is offline delecoy  United States
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Well......installed the new bias pot. The old one failed while adjusting....the bias went up very quickly. Now when trying to bias up the right channel the "instantaneous distortion alert" light on the front comes on before it reaches 5mv. Seems something may be cooked...though the amp didn't emit any foul odors or smoke when the bias on that channel ran away very briefly. It was powered off immediately.
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