Tag Archives: amp

Long tailed pair phase inverter

Hi, Let’s have some fun while simulating a long tailed pair PI under PSPICE. Here is the schematic : And here are the results of the simulation : 1Vpp signal injeted at the input. 30Vpp at the inverting and at … Continue reading

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Grid-current limiting and cut-off …

The Laney GC30V I have to service has a drive channel. While waiting for parts to service it, why not have a look on this channel ? Here is an extract of the schematic (under PSpice, but let forget that, … Continue reading

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Carlsbro CS 60 CT

A nice Carlsbro CS 60 CT to restore … Power cord is missing … Bulgin ! I will use my Marshall PA 20 power cord .. 2 Mullard EL34. The first is good, the second is dead … Recap. New … Continue reading

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Kelly amp 50W head

I got this nice Kelly amp. 50W, 3x12AX7, 2xEL34. To be checked and somewhat restored. John Kelly was a tech working for Selmer (end of ’60s, beginning of ’70s). Kelly, Selmer Treble ‘n’ Bass : twins ? Not the same … Continue reading

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