跳转到主内容

Repair and disassembly guides for guitar amplifiers.

71 个问题 查看全部

lost over half the volume after changing tubes

I replaced the tubes in my Peavy VK112 and lost over half the volume on both channels, I replaced the new tubes back to the original and still have no volume.

回答此问题 我也有这个问题

这是一个好问题吗?

得分 0

2条评论:

@shuffy you replaced all tubes? why? what happened that made you change them?

完成的

I had the amp for over ten yrs., just figured it would help upgrade the tone.

完成的

添加一条评论

1个答案

@shuffy not knowing what has happened to your amp leaves a few possibilities. Blown power transformer bad screen resistor, blown diodes, blown preamp etc. you will have to do some checking and post images of what and where you check. Use this guide for that. It will allow us to see what you see. Let us know if your tubes glow orange or if they get bright red,. That would indicate a thermal runaway caused by a loss of the bias voltage. Power down with the amp in play mode (standby on ) and let it discharge for at least 15 minutes. Then use an ohmmeter and connect it from pin 4 of tube V4 to pin 4 of tube V5. You should get around 700ohm's resistance. If so your screen resistors are okay. Here is the schematic for your amp for you to check. Peavey VK112 schematic

这个答案有帮助吗?

得分 0
添加一条评论

添加你的答案

CLIFTON HAYSLIP 将永远感激不已
浏览统计数据:

过去 24 小时: 0

过去 7 天: 3

过去 30 天: 6

总计 145