whitelabrat wrote:Success! Yeeha!
Ya'll were correct. I swapped the primaries and ultralinear taps on the left channel. I also found a loose spade on the right channel OPT primary. Music!
First impressions. I'm a bit shocked at how well the little Edcor's sound. I was expecting the low end to be very flat, but quite the opposite. Thick bass. A bit flabby, but that may be caused by other infuences. Otherwise it made my cheap bose test speakers sound better than they should.
Didn't someone do some voltage readings around the board. I may need to do some tweaking. The B+ off the rectifier was 375v and after the choke it dropped to 350v. What do most folks see after the choke?
Now I need to finish the chassis. It's scrap that I salvaged from an old Sony all-in-one stereo. It was free so I used it. I intend to support it with some decent quality pine (the 2x4 on the back is temporary). I also need to enlarge one of the holes for the front left EL84. Very sloppy I know, but it will do for now. Did I mention free?
whitelabrat wrote:I swapped out the Raytheon 12AU7 for a Dumont 12BH7 and the LF got tighter. Nice. That's a keeper.
I think the 'AU7 gives the appearance of having more bottom end. It sounds fuller, or deeper and richer. I don't think it actually renders the lower octaves "better" - in fact, I fear it may be the opposite. It could be that it is sloppier on the bottom end, but the slop gives the bass more body in a way that sounds full and appealing. It may be doing this at the expense of the mid and upper ranges. The effect is particularly noticeable on piano, acoustic guitar, strings, and vocals. I've been listening to a lot of Natalie Merchant, Indigo Girls, Sarah McLachlan, and Lorena McKennitt recently.
I think the 'BH7 really brings out the detail in the mids and highs, but the bottom nearly suffers. It loses some of the richness that it had with the 'AU7. I'm guessing the 'BH7 is more "accurate", and overall I prefer to have the detail. But, I can't help but miss what I'll call the warmth of the 'AU7.
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