You should ask the manufacturer of the amp. Send the pic of the tubes.
Red Plating??
I have a CLASS A KT88 amp that has an autobias circuit. The company rep recommended SED 6550C Winged C tubes. I purchased a quad of them. They bias OK and they sound wonderful but I just noticed that they red plate a bit. If I can figure out how to do it I will attach a picture.
The red plating is just in the inner corner of one of the plates on all 4 tubes. It looks as though I am looking at the filament through a translucent plate but I know that its red plating.
https://imgur.com/a/RVLWPcf
Can I operate like this safely? The bias does hold steady and does not fluctuate. The red plating does not change. As a Class A amp this status should hold steady. Of course, it does run hot. If all that it hurts is tube life, thats OK. These are my best sounding tubes without a doubt.
The red plating is just in the inner corner of one of the plates on all 4 tubes. It looks as though I am looking at the filament through a translucent plate but I know that its red plating.
https://imgur.com/a/RVLWPcf
Can I operate like this safely? The bias does hold steady and does not fluctuate. The red plating does not change. As a Class A amp this status should hold steady. Of course, it does run hot. If all that it hurts is tube life, thats OK. These are my best sounding tubes without a doubt.
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- 27 posts total
- 27 posts total