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In the Forum: Melquiades Amplifier
In the Thread: R22
Post Subject: The burnPosted by anthony on: 12/29/2021
R22 is there to drop the B+ to the correct level and needs to be rated so it can dissipate quite a bit of power i.e. heat. It is 12 watt in the schematic but maybe the one you are using is rated lower or perhaps you have a higher secondary voltage on the power transformer TR3. If you are using higher than 50ohm for R22 then you will probably also need to use a higher wattage resistor.
If this resistor is under-rated, others to look at include R11-R16, R23, R2 and perhaps R17 if you needed to install it.
Good to hear this amp is still being built by people...it is a good one when paired with appropriate speakers.Rerurn to Romy the Cat's Site