Just finished the build. Was able to source all resister values in .5w Takman units. Except the 2w and 3w resistors. It was not easy. I heard Takman will no longer be producing them? Used a quad, matched within 1%, Vcap set. Of course, silver solder everywhere. Also, did the headphone output resister mod posted by bhk1004. Thanks for that.
First power on with no issues. All test points tested good for expected values. Except one, TP9. Should be 175v as TP10 was, but was 167.7. Could see one of the 12ua7 tubes was glowing a lot more on the bottom than the other. I know tube brightness is not a way to judge, but to me, it looks pretty obvious this one is pulling more current than the right one, causing the voltage drop. The voltage drop followed the tube when I swapped them with each other. This was supposed to be a matched pair, which usually means also balanced. Working to get another set from the ebay seller.
WD 300B's are the new reissue units they are making now.
So, far very pleased with what I am hearing. Speakers are 90dB 8Ω so no problems running them at my usual listening levels. 50 hours of burn in so far. We will see if anything changes when I hit 100 and 200.
The WD 300B's have a very pleasing glow to them once the lights go down.
Looking hard at the upcoming Sunvalley P1616D for next build project.
First power on with no issues. All test points tested good for expected values. Except one, TP9. Should be 175v as TP10 was, but was 167.7. Could see one of the 12ua7 tubes was glowing a lot more on the bottom than the other. I know tube brightness is not a way to judge, but to me, it looks pretty obvious this one is pulling more current than the right one, causing the voltage drop. The voltage drop followed the tube when I swapped them with each other. This was supposed to be a matched pair, which usually means also balanced. Working to get another set from the ebay seller.
WD 300B's are the new reissue units they are making now.
So, far very pleased with what I am hearing. Speakers are 90dB 8Ω so no problems running them at my usual listening levels. 50 hours of burn in so far. We will see if anything changes when I hit 100 and 200.
The WD 300B's have a very pleasing glow to them once the lights go down.
Looking hard at the upcoming Sunvalley P1616D for next build project.
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Yes, as I stated in the op I swapped the left and right 12ua7's and the voltage drop followed the suspect tube. I have a new matched set coming. Going to try the Psvane 12AU7-S ECC82 Gold Pins Art Series. I have heard good things.
Thanks again for the help Victor.
Thanks again for the help Victor.
Please let me know how do you like the Psvane Art Series. I tried the old 12AU7-T MKII and I prefer it over the Brimar. May get both the 12AU7-S and the 12AX7-S to to replace the Gold Lion and the Brimar.
Thanks Victor, are these the NOS or the current production tubes? The new Mullard 12AX7 are quite economical and I can get them locally. If it is NOS, then I have to look elsewhere. I find the Brimar a bit bright for my taste (Great detail though).