Are there any other EAR 834P modders lately?


I had to beg David Schulte of Upgrade Company to mod my EAR 834P because there are so many detractors. There are also loads of DIY people who have tweaked the circuit in custom ways. The changes I had made include V-cap coupling caps and RFI shileding. Switching from using the 12AX7 tubes to 5751 or 12AT7 tubes if you can handle the lower gain also is highly beneficial. I use Valvo 6201 blue print in the one spot, Brimar and Siemen Halske 12AT7's in the gain stages 2 & 3. 2 is not left and 3 is not right- it sums the tubes for the gain stage left and right. My results are stunning. Because the 12AT7's only have 70% of the gain or the 12AX7, I changed out my Bent Audio step up tranny's for Bob's Devices Cinemag 1131 with a 1:40 or 1:20, ratio which is adjusted at the flip of a toggle switch.
zenbret

Showing 5 responses by slaw

As Frogman stated earlier, and I'm paraphrasing, the tube compliment you find most pleasing will be according to your own tastes, preferences and components/set-up. I've tried a few,( no where near most of you) and the Sylvania black plate, steel pin, 5751s were a let down in multiple configurations. While I'm not yet finished listening to different tubes, my current favorite set-up is V1 Telefunken smooth plate, V2 Mullard CV 4004, V3 60's Seimens. That's just me.

Mine has no internal mods. Replaced the stock RCAs with chassis mount WBT knock-offs. IMO, aftermarket power cord and isolation makes a substantial difference for the better.
Information overload. The other two posts I made aren't up yet, I've made one more tube change. I put the two Tele's in V2 @ V3, (still have the Seimens in V1). It's obvious that the Tele smooth plates are more sonically neutral than any of the other tubes I own. I feel the Seimens have an edge in bass power/extension,... maybe slightly unrealistic in the treble region. If I had 1 more, I'd try them in all 3 positions.
OK, I switched to the Bugle Boy in V2. Less open, only a hint of the bass the Mullard had, (soft sounding). Put the Mullard back in.

I'm working too hard, party people. Time to sign off and enjoy.
This thread got me wondering about my tube compliment. In the context of my system, these are the changes I made today while listening to Elvis Presley "Live From Memphis" Speakers Corner,. The tube orientation I previously mentioned had a little "spotlight" effect. I had previously used (2) 60's Seimens in V2 @ V3, then went for the Mullard in V2. The Mullards are warm with nice bass, however they are not the greatest for transparency/dynamics. This was a nice compliment to the other tubes, but too much of a good thing. Trying another Mullard in V3 produced a even warmer sound that I'm not very happy with. I then left one Mullard in V2, @ switched the others so the Tele is in V3 and the Seimens is in V1. Things are pretty nice now. Somehow I get the feeling of trying a Bugle Boy in V2 to replace the Mullard. Maybe later, will report back.
Zenbret: I was having fun but working hard at the same time. I guess I failed to mention I'm using a BOb's Cinemag 3440 w/ Dyna Karat D3. I'm in the process of listing my system, so it will take a while to complete. In what could only happen to me, last weekend I was using my motor enclosure design and the sound seemed different than ususal which is mainly why I decided to experiment with tubes again. Found out later that night my enclosure had split ( part of it was made from Purpleheart, I'm assumming it hadn't completetly dried. anyway, it changed the character of the sound, thats's when I started another day of re-experimenting. Luckily, I had a replacement (upgrade enclosure already in the works and installed it Tuesday). After tube swapping a good bit this week I'm back close to where I started. Siemens in V1 @ V2, Tele in V3. The enclosure works very well.