2555 voltages issues. help

Marshall Amp Discussion

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gmule12
Posts: 34
Joined: Tue Dec 06, 2016 11:46 pm
Location: Belfast

Re: 2555 voltages issues. help

Post by gmule12 »

All pins and wires are connected properly. I send power tubes back. I will rapport you back about the voltage when I get new ones. Thanks for your input. It's nice when you can found people ready to help.
Stevem
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Re: 2555 voltages issues. help

Post by Stevem »

When you get your new tubes and before installing them set the bias voltage on pin 5 to -42 volts in this way you will not harm the new tubes in any way and then when the amp has been on for 5 minutes you can set the bias current from the test points.
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gmule12
Posts: 34
Joined: Tue Dec 06, 2016 11:46 pm
Location: Belfast

Re: 2555 voltages issues. help

Post by gmule12 »

Hi everyone. Ok , I was on the phone with guy who sold me the el34l jj tubs and after testing them, hi said that tubes are ok . Ok or not? Before I send them I try set bias, in ceriatone we have slot for every tube socket for bias ok. Now. 1 tube reading was very of 51 mv where another three have 37mv. So I swap the one with 51mv in to another socket and tubes show me 50 mv . Now is my tube is bad or this guy talking shit. Thanks for any input.
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