How to fix low distorted tube amplifier volume Ex: National NC-125 Ham radio shortwave receiver
Автор: D-lab Electronics
Загружено: 2025-01-07
Просмотров: 4253
Описание: EX: National NC-125 shortwave receiver. Audio section consists of a 6SL7 preamp followed by a 6V6 class A. This same principle applies to guitar amplifiers. Volume controls should not have DC voltage present. A few millivolts is OK, but not full volt readings. On simple Class A amps that DC voltage can find its way to your output tube grid, making the idle current go wild, Red plate time! This is a good thing to check. The fix is easy. Bad caps is a common issue with old radios and amplifiers. Obviously the best thing to do is replace all of them as they will eventually cause trouble. If you need assistance with a repair, contact: d-labelectronics.com or / dlab_electronics A great source for a complete cap replacement kit is hayseedhamfest.com Top quality parts & service
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