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Dirty-South Blues Harp forum: wail on! >
5Y3 for 5F1 circuit
5Y3 for 5F1 circuit
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SuperBee
2018 posts
May 23, 2014
10:32 PM
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i built a 5F1, to testing stage..then realised i dont have a 5Y3 and they dont carry them in the local stores...
LMS offered to order one...$31 for a sovtek, twice that for a tube from mesa boogie.
i didn't bite. i thought i recalled hearing the sovtek doesnt drop as much voltage as the design calls for, and the mesa boogie offering seemed rather exxy for a tube i knew nothing about...
so now i'm looking for a suitable 5Y3. any recommendations?
my PT seems to be doing its thing ok, i measured 337VAC at pin 4 and 5.2VAC at pin 2, and the pilot lamp does its thing. but its hard to say about the rest of the circuit until i can plug a rectifier in. i guess i could test it with a 5U4 from my Princeton...Edit: no, i probably cant. my Classic Tone PT 5V winding is only rated at 2A. rats
Last Edited by SuperBee on May 23, 2014 10:36 PM
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1847
1816 posts
May 23, 2014
11:33 PM
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5y3
pretty common tube in these parts
i needed one in a hurry, they had a nos rca down the street from here 20.00 dollars out the door
the next week i got one at the swap meet for 2 or 3 dollars
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i get a lot of request when i play my harmonica
"but i play it anyway"
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SuperBee
2020 posts
May 23, 2014
11:43 PM
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only 5U4, 5AR4 and GZ34 on the shelves of the stores which were open today. i'm just itchy to test. just realised that of all the amps i have, there are only 2 others with tube rectifiers.
i'll order something online i guess. meanwhile i need to sort out some hardware to mount it in the cab.
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5F6H
1778 posts
May 24, 2014
9:28 AM
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Unless something new has hit the stores & I didn't notice, the only true, lowest voltage, 5Y3 are NOS. The Russians makea tube that is perhaps closer to a 5V4, giving higher voltage than a 5Y3.
Assuming your power supply caps have sufficient voltage rating, you can use 5Y3, 5V4, 5AR4/GZ34 (same thing), or even SS - as long as you change the 6V6 cathode resistor to keep the plate dissipation down (you might even find a reasonable compromise value?). You don't need to stay under 14W, most champs exceed this, maybe up to 20W dissipation & fine tune by ear.
5U4G(B) is a 3A 5VAC rectifier, I wouldn't recommend this unless your PT is spec'd to handle a 3A rectifier (2A is typical).
I have heard really good sounding Champs & 5F2A style amps with different rectifiers, depends largely what your actual running voltage is & how much sag you want, but differences in envelope may not be huge as a single 6V6 isn't going to punish any of the rectifiers in question.
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www.myspace.com/markburness
Last Edited by 5F6H on May 24, 2014 2:26 PM
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