7025 Vs 12ax7

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Can you help me with Bugle Boy date codes

Bias, external 12V supply, fed via a diode to the ground side of the grid coil, with a 33k resistor going to ground from the same point, bypassed by a 1nF cap. New in Box. SB GI7B conversion. It will need a filament choke and bias applied from a zener or zener and transistor combo. The perf board in the lower left contains a pot for adjusting the bias and two turn pots for calibrating the grid and plate meter scales.

Tubes – Prices on this list are out of date. 2 Of Bmw Jan 24, · Hi Guys, I am looking for the following tubes: Amperex GE FiveStar.

When you join the TCA you automatically get the current year’s back issues! Volume 17, Number 1 – February, Wierd Tube of the Month – The Duo-Deltatron A tube made with two filaments and control grids surrounded by a common screen grid and plate. The making of minature vacuum tubes. Sperti, Inc. The Mercury-Arc Rectifier A review of the smaller sized mercury-arc rectifiers.

Volume 17, Number 2 – April, Microtubes – Introduction Background of Microtubes “Inc. Zenith Microtubes – Application Guide Descriptive Literature and technical information on the application of microtubes. Comments on the Waddell-Brown Paper Review of who knew what in early microwave technology. The “Literature” of Tube Substitution Types of proceedures for substituting tubes or altering the circuit or hardware to make equipment work.

Amperex ECC88 date code weirdness

Hey fellas, It’s time to add some new tubes to my collection as I’ve pretty much exhausted my supply of spares. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. This website uses cookies, which are necessary for the technical operation of the website and are always set.

4 AMPEREX HOLLAND BUGLE BOY ECC88 6DJ8 TUBES Amperex ECC88/​6DJ8 O-Getter Heerlen Holland Same Date Strong.

The use of this valve will give more headroom and clarity and lower the gain on a over distorted valve amp. The larger plates combined with crimped construction may contribute to the background noise it produces. You aren’t actually getting 60 mu out of a 12AT7 in a 12AX7 slot, and you aren’t getting anything close to 45 mu from a 12AU7. Someone said that the 12AU7-A prefix “A” is better ‘coz gives longer life for all the tubes.

They were really hyped about years ago on this forum and I bought a complete batch for my 2 amps at the time. With hand selected quality and solid, proven performance, this JJ ECCs is a wonderfully refreshing addition to the 12AU7 family of tubes. The JJ is a wonderful complement to a 6L6-based power tube, and with comparatively low cost relative to other NOS preamp tubes. After a short warm up and bias for the JJ ‘s we were all nodding in approval about the moderate volume clean tones which were warm with a nice sparkle.

The bass is great, brings the mid-range forward with great vocals I know this because I have Fostex THs which are definitively mid-range recessed and the ECC82 is 12AU7 medium gain pre-amplifying double triode. Unfortunately I can’t compare those to the “Bugle-Boy”, which seems to reach quite high prices at the moment.

Telefunken ecc83

European number is ECC This tube has a 6L6 feel to it when playing softly, however the EL34 sound starts to shine once you crank the volume on your amplifier. These are a very consistently made tube, sweet sounding, and very warm. Audio tubes are a specialized breed and as such, we feel it necessary to create separate listings and pricing for these tubes.

12au7 tube tester According to some folks on GroupDIY, voltages for V2 We have CV A > Rare-ECCAU7-Amperex-Made-In-Holland-Amplitrex Made in Netherland Visible Date Codes: GF91G1 Lettering Condition Mar

Did you mean: amperes 18 items? Skip to main content. Include description. Vacuum Tube Items NOS Tube Items Triode Items Preamp Tubes 52 Items Amperex 1, Items 1, Mullard 60 Items RCA 40 Items GE 15 Items Raytheon 11 Items New Items

Deciphering European tube date codes

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Tests NOS Date Matched Quad (4) Amperex Holland 6DJ8/ECC88 Gray Plate Tubes. Buy it now, $, Time leftd 19h 31m.

Full and chimey mids, a tight bottom end and greatly reduced hum and noise characterize this Fredenstein F Tube Microphone Preamplifier The F is a professional tube microphone preamplifier, using two double-triodes, one ECCS and one ECCS, in a single series rack module. The tube is unused and has NOS test values that match the factory specification very precisely and balanced systems.

The tubes have the typical plate structure of the Telefunken ECCS with reinforcement and of course the diamond bottom. To Contact Form. It is rumored that Tesla actually made many tubes which eventually were labeled, boxed, and sold as German Telefunken, and the ECC S is a prime example of this often-discussed practice. This preamp tube is a good choice if your amplifier has more gain than you need and you are looking to take it down a notch from what a 12AX7 is giving you.

Ec81 tubes

Read times. Thread to share Isabella tube rolling experience. Out of curiosity, I have started to try different tubes in the Isabella. I use the mapleshade tube anchors and like all tubes better with them. The midrange may be sounding slightly thinner.

unit of quantity Country of Current month Cumulative, January to date Country 20 41 ; 1%: TELEVISION PICTURE TUBEs, color, WITH A DIODES) NO RAY TUBES 99 as 3 | over AMPEREX, 05 94

Log in or Sign up. Steve Hoffman Music Forums. Is this the rarest tube you have seen? Poll closed Oct 14, Location: Raleigh, NC. Audio Tubes. It is just possible that for some reason the Bugle Boy labels were only sold in Canada? The Holland name sandblasted into the glass is only seen on Dutch Philips or Amperex tubes coming out of Canada. Your pictures do reinforce some facts that still tell the real thing from the fake: The fake or tubes NEVER have date codes or production codes on them.

Yours does, so I will concede that you have one of the very few real Bugle Boy tubes in existence. However this is different caliber of rare even to say CCa Siemens or MiniWatt, those are just hard to find due to cost at time of production.

Rarest of the Rare: Amperex Holland 7308 Bugle Boy Ever Verified by !

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the Heerlen, Holland factory codes and matching date codes etched in the glass. Testing. Both tubes test as new. They are tested at typical operating voltages on a​.

Tubes Asylum Questions about tubes and gear that glows. This has been intriguing me for a while now, and I’ve tried searching the archives, but I haven’t found this particular question addressed. Its quite wide ranging, but please bear with me. As I interpret the Philips coding system, they would all have been made in the Heerlen plant in the Netherlands, using the same design, at the end of Would they all be identical, other than the inevitable variation between individual tubes?

Certainly nowadays, Mullard and Amperex have a cachet that Philips never seems to have achieved going by NOS prices with dealers and on E-bay, etc. Are we all paying a premium for the nice Bugle-boy and Mullard badges, with no real sound difference between them and the lowly Philips? The three tubes are made ostensibly by the same parent company Philips , though there may have been some internal marketing differences.

The question is: Are there real manufacturing differences? The tubes could have been made with different tooling, on different lines within the factory. Tooling up for that would however be a major expense.

How to Spot Super Rare 12AX7 Vacuum Tubes part I


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