Hello all, I am going to build an amp with parts I have lying around. I have a hammond 270BX PT
Specs here:http://www.hammondmfg.com/pdf/5c0026-27.pdf
I want some schematic recommendations for an amp that would use this PT.
Any insight would be helpful. I am interested in an EL84 amp. Though any design would be considered.
Thanks and have great weekend!!!!!!!!
Specs here:http://www.hammondmfg.com/pdf/5c0026-27.pdf
I want some schematic recommendations for an amp that would use this PT.
Any insight would be helpful. I am interested in an EL84 amp. Though any design would be considered.
Thanks and have great weekend!!!!!!!!
Check out the AX84 Co-op page: AX84.com - The Cooperative Tube Guitar Amp Project
I noticed the PS trans used is the 269EX, FWIW.
jeff
I noticed the PS trans used is the 269EX, FWIW.
jeff
You need to drop a loooot of voltage to bring the HV to el84 levels (320 MAX but for single ended applications more likely 250-280)
Only way I see it happening (other than big resistors), is with a choke input supply.
Do you have an Output transformer?
Only way I see it happening (other than big resistors), is with a choke input supply.
Do you have an Output transformer?
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A C-R-C should be fine also. Nothing wrong with the voltage, drop it with a zener. A SE amp I take it?
http://www.ampmaker.com/se-5a-construction-manual-948-0.html
I would grab the documentation quickly, the amp seems to be not available anymore.
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Hi,
For class A single ended with constant power supply load a correctly
arranged LC filter will have a lot less output voltage than CLC or CRC.
rgds, sreten.
For class A single ended with constant power supply load a correctly
arranged LC filter will have a lot less output voltage than CLC or CRC.
rgds, sreten.
Moving to Instruments & Amps forum per forum policy. Please see forum headers. Sorry I thought I posted in the correct forum. I don't quite understand what you mean with C-L-C, and C-R-C. Im a newb and this will be my third single ended build. Thanks for the insight and inspiration.
Power supply filter arrangement.
A typical basic power supply will have a rectifier feeding to a filter cap. Then from there usually we find either a resistor or an inductor (choke) to the next filter cap. Cap, resistor, inductor - those are what the C R and L stand for.
CRC means cap through resistor to cap. CLC means same thing except a choke instead of resistor - cap choke cap. L is the symbol for inductors.
For reasons you can look up (capacitor input filter versus inductor input filter) if the rectifier feeds to a cap first, the resulting voltage will be higher than if it feeds an inductor before it gets to a cap. Choke input filters are relatively uncommon in guitar amps. But going to that instead of a cap input filter is one way to lower the supply voltage simply.
A typical basic power supply will have a rectifier feeding to a filter cap. Then from there usually we find either a resistor or an inductor (choke) to the next filter cap. Cap, resistor, inductor - those are what the C R and L stand for.
CRC means cap through resistor to cap. CLC means same thing except a choke instead of resistor - cap choke cap. L is the symbol for inductors.
For reasons you can look up (capacitor input filter versus inductor input filter) if the rectifier feeds to a cap first, the resulting voltage will be higher than if it feeds an inductor before it gets to a cap. Choke input filters are relatively uncommon in guitar amps. But going to that instead of a cap input filter is one way to lower the supply voltage simply.
I think this is just temporary while Barry moves to a new location. He's concentrating on supplying parts only for the moment, with amp kits coming back on line when the move is complete.
Hi,
The first component in a single ended power supply is critical. A correct
inductor will average the the incoming AC half wave voltage, a capacitor
will store the peak of the voltage. As such they will have very different
output voltage and that seems to be the original posts question.
The difference is about 0.7, 320V versus 225V.
rgds, sreten.
The first component in a single ended power supply is critical. A correct
inductor will average the the incoming AC half wave voltage, a capacitor
will store the peak of the voltage. As such they will have very different
output voltage and that seems to be the original posts question.
The difference is about 0.7, 320V versus 225V.
rgds, sreten.
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