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It is currently 25 Feb 2018, 20:15

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PostPosted: 24 Feb 2018, 09:12 
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Joined: 13 Jan 2018, 21:33
Posts: 1
Hi everyone, Fairly new to the forum although I'm an avid reader of the valve pages. I would like if possible to seek advice here. Inspired by this forum I decided to take some baby steps to learning a little about electronics with the objective of building a valve amplifier. I likely put the cart before the horse and purchased from Ebay one of the may PCBs on offer. Hopefully the pics show enough detail. Having no circuit diagram (and little knowledge of circuits) I went about reverse engineering one from the PCB. I need to double check it because it does often get confusing to me which components belongs where and I need to go over it again and again. Happy1982 who provided the PCB kit has promised to send me the information but I have had it for a month now so not too hopeful on that.

Also I have no clue on the values of the voltages/current should be at the various point or for that matter the size of the power transformer, output transformers, chokes and 300b filament heater. I would appreciate any comments/advice on the circuit, if I have made mistakes - there's sure to be many, or maybe whether this circuit is based on something similar out there you have seen. I'm hoping to build knowledge so that I can purchase the correct transformers etc. I'm not quite ready to start putting it all together. I thought I would get some practice soldering and wiring first and how to safely test each stage before turning everything on (Might need to pay a specialist to help with that as my lab consists only of a multimeter and a soldering iron and I am a bit wary of electricity after getting a 240v shock from the toaster in my youth.

Also one thing I have noticed is that compared to the other circuits out there is the first stage of the 6sn7 triodes is the one having pins 4,5 and 6 but in my one it appears to be pins 1,2 and 3. Does that make a difference? Also Happy1982 Ebay provider, after I complained that I didn't have one of the caps and resistors of the right size, said there is a mistake on the PCB and I have all the right parts. I hope if I learn enough I can make the measurements and be sure myself.

Cheers woodo


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