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Tube Tip | |
Article from Polyphony, July/August 1981 |
We can substitute 6CA7 tubes in amps originally fitted for 6L6s; however, the price paid is some crossover distortion. To cure this, simply feed a sine wave generator into the input, and adjust the bias control (like the one on Fender amps found just beside the choke and power transformer) until the crossover distortion disappears. The advantage of using 6CA7s is a somewhat crisper, more defined treble, as well as bass that's a little bit tighter. You can also substitute 6550s with no bias modifications, but you must then add a fan for cooling. 6550s last longer than 6L6s due to their special construction, and do not get microphonic.
Lab Notes: Computer Music Without the Computer - or: What to do 'til your processor arrives. |
Assaulted Batteries |
First Guitar Faults - Your First Guitar |
Set It Up! |
An Emulator for £10 |
Workbench - CHECKA |
Nails And Their Nature |
The Five of Jacks |
Kit Care |
Workbench - Signal Processors - the saga continues |
Data To Music Conversion - A Low Cost Peripheral Circuit For Your Computer |
![]() Confessions - ...of an English kit builder. |
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