If that tube is so hard to find, why not buy the tube from Line Magnetic?
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The dealer that sold me mine says that the stock tubes are so pricey that he usually recommends other options, including Psvanes. I may try a pair of those, or Fullmusic. Hoping for feedback from those with experience or links to sources for this tube other than eBay, though if someone has had a good experience buying from certain vendors on eBay, that is also welcome.
Thanks for your feedback.
I considered the Fullmusic CNE tubes, but the lowest price I could find was $700-800 per pair on eBay. What do you think of them? I will research the Cossor tubes, as I have never heard of them. Would love your feedback on those as well.
As it turns out, the stock 805 tubes are only $90 each straight from the vendor for Line Magnetic stock tubes. That is half the price quoted by the dealer. For anyone out there who owns a 508ia, there is an excellent thread on the Steve Hoffman website with lots of information on tube rolling in this amp. Very informative and helpful. One guy tried several different 805 tubes and eventually went back to the stock. He has Elrog 300Bs, which I believe go for a cool $1500 per pair. I am sure they're excellent, but my EMLs will have to do for now.
After doing a lot of reading on the excellent and very informative discussion on the Steve Hoffman website regarding tube rolling in the LM 508, I tried the EML XLS 300B tubes, which are excellent and definitely a step up from the stock tube. I replaced the 6SN7 tubes with some 1940s vintage Sylvanias from Brent Jesse, which were also terrific.
I have tried a two or three 6SL7 tubes, settling for now on a Mullard ECC35--it is a bit on the pricey side, but sounds great. I think the finesse of this tube is a nice complement to the robust dynamics of the EML 300Bs.
So far, I have stuck with the stock 805 tubes. I may roll in some others at some point, though what I would really like to try would be some Elrog 300Bs. These are REALLY pricey, so it may be a while before I can experiment with these.
I am not sure I can say which change would result in the biggest difference, but I would certainly suggest trying some different 300Bs. Before you do anything, spend some time reading the Steve Hoffman thread. There are several 508 owners there who have done a lot more tube rolling than I have in their amps. You might benefit from their experiences, as I did.
The 508 is a good amp even with the stock tubes, but you can definitely take it higher by finding a combination of tubes that suits your particular tastes.
Im from Argentina and I bought my 508 from china directly from an authorized dealer because there's no Line Magnetic dealer here and the price difference was huge.
China-hifi-audio.com https://www.china-hifi-audio.com › ... Its a very profesional dealer and you can trust him. I bought a lot of items from him with out problem.
One of the things I bought were the Psvane 805A-TII tubes and they were a noticeable upgrade from the stock tubes: especially with more detail and stronger and fuller bass.
Those Psvane are not too expensive (about USD 150 plus shippment).
The only thing is that on my second pair, one I bought as a back up, I got one broken. I only had to send it back for a replacement and it cost me about USD 30 for the return shippment.
I hope it helps.
PS: I have not tried Mullards, but for 6SN7 and 6SL7 tubes in the 508, I like Tungsol the best, by far. I have tried Sylvania, RCA, GE, Ken Rad, Westinghouse, National and Shuguang Treasure and WE Replica.
My speaker Lansche 4.1 is specified to be 99db but I suspect it to be around 93db, still pretty high.
I played 1812 overture at full volume in my spacious listening space(1,500 sqf) with vault without any problem.
I also have Rogue Cronus Magnum II with KT 120 tube which company specified at 100W.
But it seems that LM 508 can play louder and deeper than Rogue Cronus Magnum II .
Rogue Cronus Magnum II is a pretty good amplifier but LM 508 is in another league above competing with those priced at 10-20k.
Yes it has active amplifiers to drive two 10 inch woofers to go down 20hz.
It is a heavenly match with LM 508.
The most nice thing is pristine treble out of plasma tweeter.
Eva Cassidy’s voice is heavenly with Lansche,
I miss that she had gone to heaven too early.
It’s little brother is on the sale at Audiogon.
@shkong78, wow gorgeous speakers up for sale.
I am waiting for my delivery of Legacy Aeris, they are active amplified for the bass section.
I am still not sure how LM 508ia will perform with them. I am also considering testing out a beefy class D amp like ATI AT542NC to power the fronts and the center at the same time. Will keep the amp that will do well at the end.
has tried rolling the 805 tube, what were your results, and--most importantly--where did you track them down?
At the time ebay and retro tube stores/wreckers that specialize in old tube radio transmitters.
The best sounding 805 I had was by far the RCA Black Plate ones over United Electronic, Amprex,Shuguang, GE.
And if you find some NOS with loose top cap or has come away, all is fixable by drilling out the top cap solder to the size of the tube wire, re gluing the top cap back with a very HT two part glue called 24hr Devcon-B then 24hr later re-soldering the wire on the top cap hole.
I've a pair of NOS United Electronic 805 tubes (made by GE I hear) sitting unused since I sold my Line Magnetic amp. They've less than 100 hours on them.
My impression was bass got fuller and rounder, highs got more extended and there was less noise/hash. The amplifier got quieter and more grounded. This is comparing to the stock tube.
It is nice to hear from you about NOS United Electronic 805 tubes.
I believe your opinion.
The only catch is how to connect from the top to other connector behind tube.
I read the instruction from the thread in Steve Hoffman Forum.
But I am not comfortable with the connection.
I also ordered new version called COSSOR VALAVE 805 made by PSVANE.
It is supposed to come on next Tuesday.
Let me see what happen.
I heard similar opinion from my Guru.
They did not spare the cost of material earlier but now they try to save the material cost.
My Guru has a NOS stock tubes worth more than 10 million USD.
Next time I see him, I will ask whether he has some NOS 805 tubes.
By the ways my Guru is not in USA.
One of Psavne Acme 805 tube went bad with bias reaching only 50mA instead of 120mA after use of just 7days.
I had tried to reach seller five times asking for replacement tube for 6 days.
But he did not respond to my message at all.
I had ordered tubes three times from him..
Previously, he used to respond to my inquiry within 2 days.
Now I do not have any faith in reliability of Psavne Acme tube which is pretty expensive.
I recommend you not to order any item from this terrible dealer.