Here are a few other tubes worth considering:
25A6 - 2.2W
6,12,26BK5 - 3.5W
6,10,12,25,35,50C5 - 1.9W
6CM6 - 2W @180V B+
6,10,15CW5 - 5.6W
6,25DT5 (Deflection amp, 9W plate)
6,25,50EH5 - 1.4W
12FX5 - 1.3W
6,10GK6
12GN7A - Video amp 11.5W Plate ??
50HK6 - 1.9W
17JQ6 - PD 10W PO??
Most of these tubes are available in multiple filament voltages, and I've listed the ones I have run across.
25A6 - 2.2W
6,12,26BK5 - 3.5W
6,10,12,25,35,50C5 - 1.9W
6CM6 - 2W @180V B+
6,10,15CW5 - 5.6W
6,25DT5 (Deflection amp, 9W plate)
6,25,50EH5 - 1.4W
12FX5 - 1.3W
6,10GK6
12GN7A - Video amp 11.5W Plate ??
50HK6 - 1.9W
17JQ6 - PD 10W PO??
Most of these tubes are available in multiple filament voltages, and I've listed the ones I have run across.
Superflea...!!!
Well Ive' started on my variation, found a chunk of Aluminum 348mm, 199mm, 4.5mm thick, four large carriage bolts, appx 100mm. This thing WAS one of those hokey steak thawing 'miracle' appliances...just a nice ribbed plate of aluminum.
I love working with Aluminum, It's so ....yielding...not like carbon steels that I'm used to.
Jorge...The sockets came in at about one week. Did you get my E-mail??
So, I will be using the 12c5..the twelve volt version, still considering to use straight AC on the 5751 or build up a 317.
The Antek toroid up top the OPTS' on bottom, flanking the Toroid is IEE socket....that has some RFI filtering circuitry(Caps & ferrites) from the "donor" power supply (computer) PWR switch w/neon (coffee pot), fuseholder (alarm unit).
I am mounting components that I have..measuring everything..have good supply of 18 gauge multicolor stranded.
I could go parallel or single...will wait till the last moment to decide that one.
_____________________________________________________Rick...
Well Ive' started on my variation, found a chunk of Aluminum 348mm, 199mm, 4.5mm thick, four large carriage bolts, appx 100mm. This thing WAS one of those hokey steak thawing 'miracle' appliances...just a nice ribbed plate of aluminum.
I love working with Aluminum, It's so ....yielding...not like carbon steels that I'm used to.
Jorge...The sockets came in at about one week. Did you get my E-mail??
So, I will be using the 12c5..the twelve volt version, still considering to use straight AC on the 5751 or build up a 317.
The Antek toroid up top the OPTS' on bottom, flanking the Toroid is IEE socket....that has some RFI filtering circuitry(Caps & ferrites) from the "donor" power supply (computer) PWR switch w/neon (coffee pot), fuseholder (alarm unit).
I am mounting components that I have..measuring everything..have good supply of 18 gauge multicolor stranded.
I could go parallel or single...will wait till the last moment to decide that one.
_____________________________________________________Rick...
Attachments
Hi! Yes I've received your mail, it was answered . Check your spam bin🙂
I've ordered some extra 5 pin sockets and 250K pot from Apex Jr.
The Antek Xformer looks like mounting an Offy engine on an old VW beetle
Send some pics when finished!
What kind of speakers it is intended to drive?
I've ordered some extra 5 pin sockets and 250K pot from Apex Jr.
The Antek Xformer looks like mounting an Offy engine on an old VW beetle
Send some pics when finished!
What kind of speakers it is intended to drive?
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Rick, Why such a large transformer?
That one is rated at over 2A and for four 50C5s you only need 200mA or 0.2A. The transformer is 10X what you need for B+.
You could use seperate B+ and Filament transormers at half the cost.
That one is rated at over 2A and for four 50C5s you only need 200mA or 0.2A. The transformer is 10X what you need for B+.
You could use seperate B+ and Filament transormers at half the cost.
I'm using such a TX for the start-up pulse & it is flexible enough to reconfigure and/or start all over with something else....I for the life of me can't understand how you could get such a voltage on B+, let alone the author finding 145 Volts!........For 200mA draw the ripple must be immense. I ran some sims thru PSUD II using some components I have on hand & came out with this noted set-up. The values are within all operating parameters. A 220mA constant current load gets me 128.41 for B+.
I believe your measured voltages maybe in error Jorge......perhaps your meter is getting "confused"............Do you have a scope on hand???
My speakers are a DIY tower design...48" High, 9" wide, thirteen inches deep, twin 6 1/2" MTM style...the Qts wound up at .933. 92 Db efficient, four Ohm. The materials used are plain MDF at ONE inch thickness, screwed & glued...two inch screws every five inches, plain butt joints.....& very heavy, solid.
________________________________________________________Rick.....
I believe your measured voltages maybe in error Jorge......perhaps your meter is getting "confused"............Do you have a scope on hand???
My speakers are a DIY tower design...48" High, 9" wide, thirteen inches deep, twin 6 1/2" MTM style...the Qts wound up at .933. 92 Db efficient, four Ohm. The materials used are plain MDF at ONE inch thickness, screwed & glued...two inch screws every five inches, plain butt joints.....& very heavy, solid.
________________________________________________________Rick.....
🙂 I don't think my true RMS brand new Fluke 113 was confused in any way.
Here, the wall socket sources a very stable 230 V /50Hz tension.
Included a PSU des. file (change the extension again to to " *.psu" and run it in your PC.
Let me know
J
PD the speakers are for sure a whole lot more impressive than my tiny Wharfedale's
Here, the wall socket sources a very stable 230 V /50Hz tension.
Included a PSU des. file (change the extension again to to " *.psu" and run it in your PC.
Let me know
J
PD the speakers are for sure a whole lot more impressive than my tiny Wharfedale's
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