Preamp Tubes – 6922 / 6DJ8 / 7308 / PCC88

Preamp Tubes – 6922 / 6DJ8 / 7308 / PCC88

Superb choice for hifi preamps and Guitar Amps. Lot Of C. The electrodes occupy a small space in the envelope. Fang founder of HiFiMan would use this very design for his new statement amp the EF, to mate with his statement headphones and well may be the new headphone kings , the HE’s. Get a low price and free shipping on thousands of items. Dashcam Lessons Recommended for you1 x 12″ all-tube guitar amplifier combo 3 channels include clean, crunch, and lead Power attenuator offers 18 watts, 5 watts, or 1 watt 3-way voicing control Powered by EL84 power tubes with an EC81 rectifier tube 3-way bright switch Add your favorite pedals via the effects loop Compact carbon fiber-wrapped wood enclosureItalien wir kommen.

Can you help me with Bugle Boy date codes

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.

Amperex Nixie Tubes (2) Holland Unbranded Nixie (1). S$ 1 bid · Time Amperex U Tube QB3/ U Date Code Vintage USED made In.

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.

8560AS-2 Transmitting Tube, Misc Amperex & Eimac Brand, (NOS – Older Date Code)

Philips Audio T ubes. Valvo Amperex Mullard. Logos and Labels. Understand Codes.

that says ‘Gt. Britain’ on the tube can actually be an Ei, RFT or Amperex. Same goes for other otherwise), dating around USA black plate 12AX7s sound​.

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. Many users claim W output from amplifiers based on this valve.

Parts layout. Although it is a tough work, which took me an hour to complete, it looks The bias voltage for GSB is between 28…35 V.

Jan 12ax7wa sylvania

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.

VALVO was an old and renowned german company. their tubes are of excellent quality, and their mother Philips) all have the Philips/VALVO/Mullard date-​codes, and for Visseaux/france, “-” for Amperex/NY, an inverted “T” for Telefunken.

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.

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

Log in or Sign up. Steve Hoffman Music Forums. Is this the rarest tube you have seen?

Not sure about Amperex, but Eimac used to use temperature-sensitive paint on the outside of the glass to imprint their logo, tube P/N and date.

Any Good? In article , yauy— at —kstar. It has nothing to do with a real Amperex Bugle Boy from a manufacturing standpoint. They are U. They also manufactured Philips designs in the Amperex tube plants, more specifically the and They look the same….

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Below is my list of pre tubes, as I currently only have hybrid tube amps, the Schiit Mjolnir 2 and the Monolith Liquid Platinum. I have not expanded much into 12AX7s yet, just two pairs to try so far. Sylvania still has more balance, more inner detail in male Cohen and female without sounding whitish. Great defined slam and bass extension.

Dating amperex tubes reviews. Philips Holland Tube Codes – Last episode ng dating.

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Dating amperex tubes

The vacuum tube business was a very incestuous one, so much so that you can rarely trust everything that is printed on a tube. Often, the printed brand or printed country is incorrect. Vacuum tubes were simply a commodity that everyone needed like batteries or light bulbs are today. For the most part, back then no one cared when a tube was made or who made it, they just wanted a good product that would work and bring their radio, amplifier or TV back to life.

Which is part of the reason it can be so hard to figure out today.

Amperex 6EJ7 EF R.F. pentode vacuum tube. Hewlett Dating Amperex valves & boxes; Vacuum tube, thermionic valve, electron tube.

Kt88 Amps 16 greyscales, x resolution or slightly less , 50kk file size These look great on my monitor. All was working OK. KT88 are not same sound getting if Maker is different. As a result, KT88’s and ‘s are produce cleaner tones and have low distortion, making it popular amongst bass amplifiers and high end audio applications.

For the chassie the my choice is the HiFi mod. I then proceeded to lift the AC heater supply for the preamp tubes to a fixed voltage above ground, some 45V DC.

Amperex 12ax7 without date codes? now with pics

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. In fact, neither of them is as clear as many other available choices such as any ’50s US-made 12AX7. I’m not familiar with the voltage or bias placed onto the 12AX7 sockets of your unitbut it may be conservative.

Philips Audio Tubes. (Valvo Amperex Mullard) The codes are written in two lines on standard tubes and in two rows on special tubes (as E88CC) on the glass close to the base. Example: I66 Δ0K4 I6 = ECC83 I66 = ECC83 of construction #6.

Amplitrex at reviews. I think since most of the uses today are for audio amp the Amplitrex AT will give a Passable test. What physical sizes of tubes will the AT test? The AT accommodates 7 and 9-pin miniature tubes, standard octal tubes, and 4, 5 and 6-pin small base tubes with a filament voltage between 1. The casings on each of the 9V batteries were loose and hung up on part of the door making it very difficult to open.

There are much better sounding tubes out there than the stock McIntosh re-branded tubes that come with the equipment. It has an usb socket to connect with a computer for control and printing of graphs or tube measurement labels. The new amp sounds really good — spacious, detailed, dynamic — with most of the stuff I listen to, acoustic, voice, strings, orchestra etc.

Most of the time, you need to manually adjust the test settings for each tube type in order to tailor it to your needs. They say they’ll run your tubes at operating voltages on an Amplitrex AT and check for microphonics, gas, leaks, noise, etc.

Amperex ECC88 date code weirdness

It looks like you’re new here. If you want to get involved, click one of these buttons! Free Shipping on All Orders! Contact Account Shopping Cart. June edited June in Electronics.

I pulled all these tubes from a Harmon-Kardon receiver (?) Usually Amperex date codes are etched on the side of the glass,,near the.

To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. I have always been intrigued by tube amplifiers, but most DIY kits are very expensive and use very high voltage. Individual test measurement results for each tube along with photos will be provided to you upon your order. My Hickcock tube tester definitely has 2 columns and the actual tube types on the left hand side are considerably away from those on the left hand side.

Find reviews, data sheets and specs to help upgrade your tube amplifier and preamp. Some tube amps are really good to use as tube testers when you understand what tube sockets correlate to which channel. Not sure if this is the right subreddit for this, but I really appreciate any insight you can give me! The Unit: Here’s the schematic – I wish i could find a cleaner copy.

Most tube testers were not designed to evaluate balanced plate sections when testing a filament-type rectifier tube. If in doubt, check with your amp or preamp manufacturer to see if this tube will work OK in your application. Next, if you have tube-driven effects on your amp, try a 12AU7 or a 12AT7 and see if you prefer the results to a 12AX7 tube in this part of the amp. These are all pin compatable with one another, the only differences being the gain factor of each tube.

Click on here for a variable voltage filament supply to accomodate odd voltage power triodes 2A3, B, 50, etc.

Upscale Audio’s Kevin Deal reviews the Telefunken E88CC/6922

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