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Angela Super Single-ended build

2675 Views 78 Replies 11 Participants Last post by  Alan Small
Many of you may have already tackled this build which was a hot item in the late 90s.

I have just ordered up the parts needed from Nextgen to start my next project.

Got some fancy turrets from Nextgen too! a new item for them which i find useful in socket wiring.
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Transformers and chassis arrived quickly from nextgen馃槉
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I have stared at that schematic for a long time and thought about building it. It is essentially a 5F2-A Princeton, but with a pair of power tubes in single-ended format, rather than just one as in the actual Princeton (and Champ), and a paralleled pair of 5Y3 rectifier tubes for the added current requirement. Is the real increment to wattage, by adding the second power tube, enough to yield an audible boost in output level? I'll let you tell us, Alan. ;) Looking forward to your report.
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I have stared at that schematic for a long time and thought about building it. It is essentially a 5F2-A Princeton, but with a pair of power tubes in single-ended format, rather than just one as in the actual Princeton (and Champ), and a paralleled pair of 5Y3 rectifier tubes for the added current requirement. Is the real increment to wattage, by adding the second power tube, enough to yield an audible boost in output level? I'll let you tell us, Alan. ;) Looking forward to your report.
Certainly I will report; I expect a stouter foundation than a champ or princeton and perhaps a noticable increase in headroom and volume(20% possibly if that can actually be described accurately) .
Mostly this is for my mind absorbing hobby desire...and it will look neat to nerds
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I have stared at that schematic for a long time and thought about building it. It is essentially a 5F2-A Princeton, but with a pair of power tubes in single-ended format, rather than just one as in the actual Princeton (and Champ), and a paralleled pair of 5Y3 rectifier tubes for the added current requirement. Is the real increment to wattage, by adding the second power tube, enough to yield an audible boost in output level? I'll let you tell us, Alan. ;) Looking forward to your report.
or a Gibson GA-8 with dual rectifiers:
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Heater circuit need an artificial ground for less noise.
100 ohms resistors will do the job too.


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Full wave bridge Alan?
Full wave bridge Alan?
Full wave with 1N5408Gs....bridged and centre tap lifted is what I have on the test board now
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Heater circuit need an artificial ground for less noise.
100 ohms resistors will do the job too.


View attachment 450613
Yes. Always when the 6.3 supply does not have a centre tap馃槉
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Hammond 269AX series is what i ordered
Planning on a solid state rectifier using (edit)1n5408s
The ax does not have a 5v winding.

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I'm just wondering what your B+ will be.
The 269ax is a 250v ct and the ex is 380v cy; I am expecting 325 "ish" on the output tap...i will report
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I built one of these 12 years ago. I think your Power transformer is too small with only 2A of 6.3VAC filament power. Steve Ahola from Angela wrote all the instructions etc and he recommended a Fender Deluxe size transformer so I ordered a Weber with dual secondaries.
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I built one of these 12 years ago. I think your Power transformer is too small with only 2A of 6.3VAC filament power. Steve Ahola from Angela wrote all the instructions etc and he recommended a Fender Deluxe size transformer so I ordered a Weber with dual secondaries.
You may be right...i have a 269EX also and it has 2.5 amps

.3 amps x 1(12ax7) = .3
.45 amps x 2(6V6) = .9

2 amps should cover it ...will see how it goes....making do with what we have is part and parcel of hobbyists and army personnel in the trenches back in the day and maybe folks in fly in communities
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269EX or 269AX? AX in the earlier pictures. l'm not sure either will work, 290BX or BBX would be the Deluxe PT's. Deluxe's had hellish high voltages.
I built one of these 12 years ago. I think your Power transformer is too small with only 2A of 6.3VAC filament power. Steve Ahola from Angela wrote all the instructions etc and he recommended a Fender Deluxe size transformer so I ordered a Weber with dual secondaries.
Melkisethian?
Melkisethian?
Yes thats Steve s last name
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