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Old 1st June 2012, 05:48 PM   #1
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Default Recommendations for single ended guitar amp build

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!!!!!!!!
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Old 1st June 2012, 06:06 PM   #2
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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
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Old 1st June 2012, 07:37 PM   #3
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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?

Last edited by costis_n; 1st June 2012 at 07:42 PM.
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Old 1st June 2012, 07:58 PM   #4
jane is offline jane  Norway
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Hammond 270BX with a tube rectifier and C-L-C filter should be close to 320V B+.
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Old 1st June 2012, 09:53 PM   #5
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Quote:
Originally Posted by jane View Post
Hammond 270BX with a tube rectifier and C-L-C filter should be close to 320V B+.
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-constr...ual-948-0.html

I would grab the documentation quickly, the amp seems to be not available anymore.

Last edited by Printer2; 1st June 2012 at 10:00 PM.
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Old 1st June 2012, 10:05 PM   #6
sreten is offline sreten  United Kingdom
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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.
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Old 2nd June 2012, 12:03 AM   #7
kevinkr is offline kevinkr  United States
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Moving to Instruments & Amps forum per forum policy. Please see forum headers.

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Tubes / Valves All about our sweet vacuum tubes Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum
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Old 2nd June 2012, 03:44 AM   #8
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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.
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Old 2nd June 2012, 06:18 AM   #9
Enzo is offline Enzo  United States
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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.
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Old 2nd June 2012, 03:42 PM   #10
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Quote:
Originally Posted by Printer2 View Post
SE-5a Construction manual

I would grab the documentation quickly, the amp seems to be not available anymore.
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.
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