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Old 25th April 2006, 12:32 PM   #1
kmj is offline kmj  Sweden
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Default Advice regarding philips/mullard EL34

Hi guys!
For a long time now I have been looking for a reasonable project for a poweramp and setteled for the one Claus Byrith made for Lundahl, here . As always money is a factor and to soften the blow I started to look for special deals and such. It might take some time but it could be worth it. Accually, it isn't the amp itself thats the problem but rather all the other small projects around it .

Anyway, I found an old add which had been out for almost a year and sent the guy a mail asking it the stuff was still avaiable, which it was. "one pair of Andersson60 irons, 4pc of new tubes and 7 old ones suitable for testing" he said....

Now it so happend that the "old" tubes where old but not in the sence of them being used up, just old. The seven old ones where all Philips miniwatt made in GB, the ones with a metal base and dual halos. I think it was XF2 and atleast one of the tubes says "by mullard". I can't remember for sure since I left them at another place for the week.... Clever as I am...

Well, I had them tested and all tested 72mA or higher. If it is of consiquence there are no original boxes and the printing is worn but readable.

Now, here's the thing. These are suppost to be really good tubes but I do not wish to use them myself since I with all probability wouldn't dare to play with them. And since they are rare and thus probably valuable these could help finance this expencise hobby for a while.

What I'm getting at is that I could use some help setting a price for the tubes If I now decide to sell them. I feels kind of cheap starting a thread about it but what can you do??

I hope that you guys have some advice in this question.
Kind regards
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Old 25th April 2006, 09:52 PM   #2
kmj is offline kmj  Sweden
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no one who has an ida?
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Old 26th April 2006, 04:43 PM   #3
anatech is offline anatech  Canada
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Hi kmj,
Just use them, or put them on E-bay. Myself, I'd just use them.

-Chris
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Old 26th April 2006, 04:58 PM   #4
kevinkr is offline kevinkr  United States
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With some consideration to what they might actually be worth on a good day I would probably put them up on eBay, but you need to find someone to test them properly and post the measured transconductance, (Possibly at a specified plate current even better) no gas, no shorts for each tube you sell. This will allow the prospective buyer if savvy to gauge how much life is left in these tubes.

You might sell them as unmatched pairs with the extra odd one thrown in for good measure or sell them as a lot.

Make sure to make the usual disclaimers, sell as is, but tested good. Selling tubes on eBay has become something like opening pandora's box, everyone expects perfection from 40 yr old used components, and sometimes the prices reflect this fact. Incidentally Far East customers are by far the fussiest, but most interested buyers I have encountered.

Reserve price auctions cost a lot, and seem to often result in no sale, and sometimes by just a couple of $ so I don't recommend them at all.

One question you need to ask is whether or not you can get enough for them to make it worth your while to sell them at all, unless you get top dollar a quartet of current production tubes may run you a substantial portion of what you get for these.

I'm not sure what these are worth, I would just take a look at eBay and see what others are selling comparable used mini-watt and mullard tubes for.

That said I don't use EL34 in any of my current designs, and am not in the market for same..

JMTCW.. YMMV.. etc..
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Old 27th April 2006, 11:55 PM   #5
cerrem is offline cerrem  United States
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Personally I consider the Mullard EL34 a great valve...but for guitar amps.. Due to the smooth sound and harmonic signature it produces....
For Hi-Fi audio applications I use the Sylvania 6CA7, which I belive sounds cleaner and tighter and more robust than the UK made EL34.... The 6CA7 is the US equivalent... it is fairly close in terms of plate resistance and gm....

Chris
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Old 28th April 2006, 03:11 PM   #6
kmj is offline kmj  Sweden
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Oh, thanks for the replys and advice.

Quote:
but you need to find someone to test them properly and post the measured transconductance, (Possibly at a specified plate current even better) no gas, no shorts for each tube you sell.
I had them tested with an Avo MkIV according to some specs the tester had. I myself don't know which but He said they where ok. They should measure 75mA for optimal as I understood it, these measured 76, 72, 82, 82. The two mullards had black base.

Quote:
Make sure to make the usual disclaimers, sell as is, but tested good.
hehe, thats for sure!

Quote:
I'm not sure what these are worth, I would just take a look at eBay and see what others are selling comparable used mini-watt and mullard tubes for.
The day after my first post (i think) one single philipstube went for 125$. Now theres a pair of Telefunkens that are higher than that!

I took a picture of them, heres one of them:
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Old 28th April 2006, 03:20 PM   #7
kmj is offline kmj  Sweden
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To specify a bit more:

Valve 1: Philips Miniwatt, Metal base made in holland. SY1 57E. Measured 76mA with AVO MkIV.
Valve 2: Philips Miniwatt, Metal base made in holland. SY1 57E. Measured 82mA with AVO MkIV.
Valve 3: Philips Miniwatt, Metal base made in holland. SY1 57D. Measured 82mA with AVO MkIV.
Valve 4: Philips Miniwatt, Metal base made in holland. SY1 57E. Measured 72mA with AVO MkIV.
Valve 5: By Mullard, black base made in great britain. XF2. Double halos. Measured 81mA with AVO MkIV.
Valve 6: Philips Miniwatt, Metal base made in holland. SY1 57E. Measured 78mA with AVO MkIV.

Valve 7: By ??, black base. Double halos. Measured 90mA with AVO MkIV. (same as Valve 5?)
Valve 8: Siemens black base measured 65mA with AVO MkIV.
Valve 9: Siemens black base measured 66mA with AVO MkIV.
Valve 10: Siemens black base measured 75mA with AVO MkIV.
Valve 11: Siemens black base measured 95mA with AVO MkIV.
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Old 28th April 2006, 03:57 PM   #8
kevinkr is offline kevinkr  United States
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You've got some really nice ones for sure. The metal based ones whether mullard or mini-watt will sell for really big bucks. These are perhaps the most sought after and desirable of the lot.

I disagree with another poster here and have found the various incarnations of mullard/valvo/mini-watt EL34's to sound better in my designs than anything else I have tried. U.S. made 6CA7 aren't even close in my estimation, but again this is my opinion.. It is probably a question of design, component quality and system matching issues.

I would consider keeping a quartet of these, I think you'll really regret selling them later. No current production tube is close to these in performance or sound quality imho.. Just slow down and save your pennies - hard to do and I am not a good taker of my own advice..

I would keep all of the mini-watts and sell the rest. Siemens are also a trendy type and should fetch a good price.
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Old 28th April 2006, 04:03 PM   #9
kmj is offline kmj  Sweden
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Quote:
Just slow down and save your pennies - hard to do and I am not a good taker of my own advice..
Niether am I

Quote:
I would consider keeping a quartet of these, I think you'll really regret selling them later.
My "problem" is more in the lines of if I use these and wear them out, I'll NEVER pay that amount myself to replace them
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Old 28th April 2006, 04:15 PM   #10
anatech is offline anatech  Canada
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Hi Kevinkr,
So far the 6CA7EH sounds the best in my Eico HF-87, IMHO. Haven't tried anything from JJ yet.
Quote:
It is probably a question of design, component quality and system matching issues.
That is a certainty. I would probably find the opposite true in a European amp. I can tell you I would have a very hard time justifying the prices some of these tubes go for. (as I breathe a sigh of relief)

The amp also measures better with these (6CA7EH) tubes. THe amp was rebuilt to original spec. using film caps (nothing special) just so you have an idea. Metal Oxide resistors for the most part.

-Chris
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