Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Crack-a-two-a => Topic started by: grosen on December 03, 2020, 01:14:06 PM
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Hi all. My new C2A has been up and running without a hitch for about a week. Just now I noticed that the 6080 seems to be red plating. Haven't put the amp back on the bench yet, but thought I'd ask where the problem is likely to be. Thanks in advance.
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First step is to check your voltages. Watch that tube when you do, don't run it for more than a minute or so.
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Thanks, Doc. The voltages look fine, except that
KregB on the Low Current board is 6.3V, when it should be between 3V and 6V, and
OB on the High Current boards is 88V on one; 82.5 V on the other, when it should be between 90 and 110V.
Here's the complete set of readings.
Low current
Spec Measured
IA 150 148
OA 60-90 70.6
KregA 3-6 4.5
bRegA 150 148
IB 150 148
OB 60-90 67.1
KregB 3-6 6.3
bRegB 150 147
High Current D B
IA 190 186 188
OA 150 147 149
bA 0 .3mV .5mV
IB 0 .3mV .6mV
OB 90-110 82.5 88
bB 150 149 149
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Can you post a picture of the red plating?
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Not sure how to post a pic. Let's see if this works.
https://postimg.cc/7J405T1j
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I don't see any red plating. I do see a nice hot cathode sleeve, but that's totally normal.
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That’s great. Thanks. I wasn’t sure, but it looked unfamiliar to me, and like some of the pics of red plating on the web. Good to know it’s normal.
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Bonus pic of amp. All stock with eccentric paint job and ambrosia maple case. Thanks to Paul for chiming in so quickly.
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Very nice! Painting the stock knobs is a really cool touch. I don't recall seeing that before. What kind of paint did you use?
cheers, Derek
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Thanks. The knobs and transformer edges are Rustoleum Gloss Enamel red. The plate and the transformer cover are Rustoleum Oil Rubbed Bronze metallic.
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That's a nice looking build!
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I like the maple a lot.