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Post by PinkFloyd on Sept 26, 2012 7:29:30 GMT
A while ago I started a "valve of the day" thread where I selected a prime valve (tube) from my stash of Vintage Russian 6N23P. Well folks, it's back again I'll be offering a "select" valve every day which can be used in amps like the Project , the Indeed, The Bravo, The AUNE T1 etc. These will all be tested on my Tube Imp Mini TT valve analyser and will be individually tested "sonically" in My Project amp to ensure there are no unexpected nasties such as microphonics. Today's valve of the day will appear shortly
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Deleted
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Post by Deleted on Sept 26, 2012 8:48:53 GMT
great service !
Would prefer that over ANY ebay offering.
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Post by PinkFloyd on Sept 26, 2012 10:50:31 GMT
Today's valve is from 1974. It is a 6N23P (6H23N) and measures absolutely 100% "strong". Nice crisp markings. £20 shipped SOLD!
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layums
100+
Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
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Post by layums on Sept 26, 2012 11:01:38 GMT
Great idea Mike. It will also lighten your 1000's load :-)
I know not a lot. So at the moment it's eeeeneee miiineeee mineeee mooooo until I get a feeling for what it's all about.
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Post by PinkFloyd on Sept 28, 2012 12:54:19 GMT
Today's valve is from 1971. Double getter supports, very ripe markings, measures 100% in ALL departments. £22 SOLD!
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Post by Deleted on Sept 28, 2012 15:51:23 GMT
Mike, you're going to get me in trouble. I nearly bought yesterday's and now nearly today's. Keep this up and I'll end up a grand in debt!!!
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Post by PinkFloyd on Sept 28, 2012 18:10:34 GMT
Mike, you're going to get me in trouble. I nearly bought yesterday's and now nearly today's. Keep this up and I'll end up a grand in debt!!! These are all singles Ian, all leftovers from "sets".... ideal for amps like the PS and T1..... when I sell pairs I always sell them from the same batch / same date codes etc.... the valve of the day is random "single", I just don't pair them up with other random singles / different dates..... dunno why, maybe I'm just a bit OCD? I always like to sell a pair from the same batch. Tomorrow's VOTD is a real cracker Dates from 1965 and is absolutely 100% in all departments
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Post by PinkFloyd on Oct 7, 2013 18:35:48 GMT
I'm going to start this going again.... I've sorted out some real beauties (E88CC / ECC88 / 6922) that I have selected for use as "singles" (ie: not pairs) which can be used in the likes of the Indeed / Bravo type amplifiers..... each valve has been selected (from many) to ensure that both sides are an almost perfect match..... it's taken me some time to select these valves but rest assured that these are perfectly matched dual triodes (within 5% per side!)...... I'll upload a few to get this going tomorrow.
Mike.
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Post by PinkFloyd on Oct 8, 2013 19:37:52 GMT
Today's valves are both Mullards. Both of them absolutely 100% Genuine NOS and both valves chosen because of how close they match (per section). Valve one: Mullard E88CC (6922) Gold pin, from the Mitcham plant (UK) New in Box Mullard gold pin E88CC coded 7L1 R5C4 (Mitcham plant, England). 12.5 (gm) is the top new valve standard reading and this beauty went one better, tested on my calibrated tube imp analyser: Section 1: gm = 13.12 / Gain 33.7 Section 2: gm = 13.04 / Gain 33.6 You just won't get better than that so for you perfectionists, who demand a perfectly matched valve, you have just found it! In any amp which requires one dual triode valve (indeed, Bravo, Sunrise, Ember) etc. this is the ultimate, in my opinion, it is perfectly matched and it's a UK made Mullard....... no need to say any more on the Mullard sound apart from, it's probably the nicest tone you'll get from any valve especially when it's a pristine NOS example with closely matched sections..... This is the real deal, not an old knackered one that has been pulled out of some vintage gear and advertised as "NOS"..... the only place this has been its entire life is inside it's original carton. £70 GBPValve Two: Mullard ECC88 (6DJ8) UK made Yet another Mullard but this time an ECC88 (6DJ8)..... pretty much the same house sound as the gold pinned E88CC the only difference being the lifespan of the valve. E88CC (6922) is the Premium version of the ECC88 (6DJ8) with heater current reduced from 365ma to 300ma. E88CC will have a slightly longer lifespan than a ECC88, in some cases E88CC will last 5-10,000 hours vs 3-4,000 hrs for an ECC88. Those "hours" are not actual "hours" they are hours with the valves working at their absolute maximum ratings...... in applications such as the indeed / Bravo / Sunrise / Bravo etc. they will stay in spec a lot longer as they are not working at anywhere near their maximum ratings........ Anyhoo........ the Mullard ECC88 measures in at: Section 1: gm = 12.89 / Gain 33.9 Section 2: gm = 12.87 / Gain 33.6 100% perfect and you won't get a closer side to side match for love nor money. Absolutely 100% NOS but the top of the carton has been ripped off...... the Valve, itself, is 100% NOS and has perfectly (as good as) matched sections and tests at well above 12.5 gm. Once again, you don't often find a dual triode with such perfectly matched sides so this is guaranteed to blow your mind! £35 GBP
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Post by PinkFloyd on Oct 9, 2013 19:40:54 GMT
Today's valve is an Electro Harmonix EH6922. These are current production valves made in Russia and are considered by many to be some of the best new production valves available. They are basically the same "build" as the famous 6N23P-EB but they just can't build them the same..... I am one of those who "don't" believe they are some of the best new production valves available.... the people building them now quite simply don't have the experience that the workers did when there were factories full of people whose dedicated daily job was building valves..... this is why "genuine" NOS are so desirable, the quality control and the expertise back then was second to none. I have 12 of the EH6922 and could only get ONE out of the twelve to match closely (per triode)..... some of them were so far out it was beyond belief! for example, one side would be 12.5gm @ 90V and the other would be 12.5gm @ 120V..... totally crap! I flicked one (side to side) at 90V..... side one was 11.4 and side two 7.3..... erm..... not at all good...... in other words, as "matched" as a gorilla and a zebra in the same bed! Anyhoo....... I wouldn't touch these valves with a bargepole due to their EXTREMELY wide tolerances....... for christ sake you are talking between +/- 20% / 50% per side in some cases!! That is just not acceptable! Word is that they are "improving", the more used they get to making valves the better they are getting, but I certainly won't be buying any more, anytime soon! Having said that...... Out of a barrel of bad apples always comes one good one and this is it: Out of the twelve I put through my tube imp analyser this one came out as an extremely "good" one" (for a matched triode)..... here are the results (all tested at same voltage): Section 1: gm 12.68 / Gain 33.5 Section 2: gm 12.73 / Gain 32.9 It's got to go down as "valve of the day"....... the other ELEVEN (or ten) will be sold as pairs. £30 and a damned bargain at that!
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Post by PinkFloyd on Oct 9, 2013 19:54:02 GMT
Tomorrow's valve will be a vintage NOS Russian..... I have cartons, from the 60's to 90' so if you'd like one which was made on your birth date then let me know...... I'll do my best to match one up (to perfection) for you. It's obviously going to be more expensive going for a matched triode (both sections matched) due to the "time" it takes to find that perfect matched triode but, believe me folks, it's money well spent. It's all very well shoving a valve into your amp but if you're shoving a "way out" (per side) valve into your amp you're going to get a way out sound, "way out" meaning "not the best" in this sense. These amps that utilise a single dual triode valve (tube) really do benefit / require triodes that are operating from the same hymn sheet.
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