[Alan Small]

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 have both and hope either will work ...the 6.3 filament total draw is 1.2 amps for the three tubes.
As far as voltages go on the B+: I like the audio of lower plate voltages on champs and it sure wont be wearing out any tubes😉
I have 310 at B+1

I appreciate all the helpful encouraging suggestions. Thank you all.

 

[Paul Running]

As far as voltages go on the B+: I like the audio of lower plate voltages

Eureka!

 

[Alan Small]

These particular power trannies offer a wall source variable option...with black and white wires i get tweed(lower by 15%)secondary voltages which is what I am using now

...using the grey and white supply wires I will realize higher voltages on the secondary....i think a dpdt on off on switch will be useful in some circumstances

 

[WCGill]

Yeah, diode rectification will give you higher B+ than the 5Y3's.

 

[Alan Small]

I had about 80 pcs of unknown brand sayal supplied "1n4007" supposed part #

Not trusting them for the long haul I have ordered some heftier and higher rated diodes to replace them...they may be in a box that arrived yesterday...

Do any of you have a preferred diode(s) for this rectification purpose?; if so, please provide canadian supplier and part #....i got dizzy looking at the mouser website

 

[WCGill]

Use 2 1N4007 in series, each leg, or better, UF4007. 1N5408 are 3A, 1KV, big buggers.

 

[epis]

IMHO, daisy chained 1n4007 is good enough (like fender did in the past)
I prefer 1n5407 only because of look, they look better in tube amps where all components are bigger
I didn't find any improvement using fast diodes there.
About your power transformer, you'll get over 500 volts b+.
You'll have to adjust cathode resistor to keep proper dissipation.
How it will sound, I don't know.
Just my 2 cents.

 

[epis]

Sorry I meant 15408.

 

[Paul Running]

A Hammond 280CX is rated 450+ watts...is this the XFMR of choice?
400VAC secondary will produce 565VDC, no-load.
6A filament current.
Is this the XFMR that you plan to use for the Angela?

 

[Alan Small]

A Hammond 280CX is rated 450+ watts...is this the XFMR of choice?
400VAC secondary will produce 565VDC, no-load.
6A filament current.
Is this the XFMR that you plan to use for the Angela? View attachment 450921

i am going to use what I have onhand and was not planning on ordering another piece...if the results are lackluster I will make the change.
I see a 1.3 amp total 6.3 current draw...6 amps would be unnecessary ,I think....

 

[Alan Small]

Using the 269EX I lifted the centre tap and built a bridge rectifier with the 1N5408G s that arrived yesterday and upped the filtering resevoir somewhat to acheive a smoother quieter supply which read 499v no load and 345v on the plates(pin 3) loaded.

I preferred working with the larger diodes(eyesight and steady hands both failing in old age); I have little experience with solid state rectifiers.

 

[Paul Running]

read 499v no load and 345v on the plates(pin 3) loaded.

The secondary of the power transformer is overloaded...a 65mA rated secondary will be overstressed for full service of 2 × 6V6 in class A operation.

 

[diyfabtone]

First guitar amp I built was one of these babies. I even had an Audio Note 2k5 output tranny (from 300B mono blocks I built). It was absolutely killer - MUCH louder and fuller sounding than anyone would expect from a '15W' amp. Not just loud, probably to best sounding tone I had from an guitar amp. I reused the chassis and trannies for an AC15 build ... stupid I know, but I plan on building another next year when I retire. I think this is one of the best projects/amps you can build - SE has such a big 3D type of tone, really addictive. Champs sound nice with the typical small combo cab but much, much better through a big cab or multiple cabs. The Super SE circuit from Angela is even better!

 

[Alan Small]

The secondary of the power transformer is overloaded...a 65mA rated secondary will be overstressed for full service of 2 × 6V6 in class A operation.

Ok and thank you...I will read up on this and obtain an appropriate power tranny for 2x 6v6 in class A

 

[Alan Small]

Cabinet design and build started...planning on antique white lacquer inside and out...the chassis will sit tubes and trannies up on the shelf above the speaker

 

[Alan Small]

 

[WCGill]

I'm thinking 2 speakers would be awesome here, out of phase of course.

 

[Alan Small]

pondering grill options on hand today...

 

[Alan Small]

The black chex is anti- skid shelf liner, the white and pattern are bath floor mat: both dollar store grabs....

the white and pattern will cause a frequency blocking affect which may be detrimental....I will use the black chex or a black woven grasscloth

 

[Alan Small]