Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: EKDENTON on April 15, 2016, 12:07:21 pm
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On the schematic below it has the cathodes on V2 tied together. This would create twice the current on the cathode....right? Should that 1k2 be changed to a 750 ohm resistor? The capacitor symbols seem to be drawn odd also.....
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On the schematic below it has the cathodes on V2 tied together. This would create twice the current on the cathode....right? Should that 1k2 be changed to a 750 ohm resistor? ...
Did you mean 1.5kΩ? The only 1.2kΩ resistor I see is in the long-tail inverter.
If you mean one of the 1.5kΩ resistors, they shouldn't share a cathode connection because they're amplifying opposite-phase signals. The cathode connection would be positive feedback...
... The capacitor symbols seem to be drawn odd also.....
Whoever drew the schematic used a symbol for a polarized cap everywhere, likely without understanding what it implied. They also drew the curved plate (usually the - plate) on the wrong side for all the e'lytic caps. Oh well...
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opps! I was looking at the wrong schemtic. That is the phase inverter not the second valve. Sorry, I should have looked at that closer before asking that.