300b vs 845

Grummer, I've ordered a pair of the new (vertical) versions of the AQ1006s, so your comments are VERY interesting. Other than tubes, are your amps still original...caps, resistors, etc? I've been thru the schematic for the just-superceded version, and it's ripe for improvement, as someone above said. The almost-1000VDC output-stage power supply presents problems for replacement caps; I believe I'll be using 500V. Panasonic TS-UPs in the 1st pole and a 51/1500 Solen metallized 'propylene in the 2nd. I really like the idea of this amp's tube-regulated front-end powersupply. The rest of the amp is pretty standard in what it will get for parts upgrades. I have hand-written notes and a notated schematic that I'll e-mail to anyone who asks--jeffreybehr(at)cox(dot)net.

Have you tried the more-generic Shuguang 845 tube v. the ValveArt 845 and noticed any differences? The former are a little less expensive, but the latter can be bought in matched pairs, FWTW in mono-SETs, for $80/pr. from Advantage Tube Services in FL.
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Jeffreybehr, no i havent tried the more-generic Shuguang 845 tube v. the ValveArt 845, still running the stock ASL845 tubes. I have no spare 845's so obviously, I would need to read alot these varients. Similar to what you may be saying (correct me if im wrong), sometimes plainer varients can win over because the synergy of the system hold it together better than fall apart in vain with excess open-ness. It doesnt matter of the most exotic is hailed about the most, It's how it would 'open up' or 'enrich the details' or even 'flow it out better' depending on what it is lacking or got too much of in audiabily sense. it will be quite a while before i get to this point :)

Isn't the Valve Art 845 just a rebranded Shuguang? The dealer told me this when I bought my 845Bs. I am curious because I may buy a spare set of 845Bs in the near future, and I want to make sure that I get the Valve Arts if they are different from the Shuguangs.

Jeffreyds ,
i have came across some sites which are reviews of some of these chinese valves,
and take note of appearance, descriptions, even use google image search or just plain google try trace if any pictures compares, you would know if the source (net or dealer) is accurate or not.

http://db.audioasylum.com/cgi/m.mpl?forum=tubes&n=156265&highlight=845M&r=&session

http://www.positive-feedback.com/Issue15/845.htm

hope these helps

im not even sure, but getting there in terms of gathering information, it wont be till well into 2007 i'd get either 845B or 845M or even a NOS... will let you know

I agree with you about upgrading the caps, chokes and windings for the ASL, however , im not experienced enough to do this myself but has a small fortune to know a retired army engineer who does, ONLY if it does breaks down, id replace if i have to (thin wallet now).

Cheers

The valve art is just a rebranded Shuguang. Valve ART claims that are built to better tolances for them. I bought some. Didn't A-B very much time though. AS I don't think there was any difference. One out of the three pairs I ordered, one was cryoed and failed after a couple of weeks before I could compare to the non cryoed.

Valve Art doesn't charge much more their's. I think the name looks better anyway than Shuguang. But don't waste too much time thinking about this.
Steve.