This page lists all of the 12AU7 tubes I currently have in stock, including all industrial and European versions. It is a long page, use your scroll button and scroll down the page to see it all. This list is organized now by each vintage tube manufacturer.

2016年6月17日 · It was designed as a true low frequency voltage amplifier. It is 6.3V though with pin n.9 connected to a screen between the two halves. Amplification factor is 35 and average gm 4.5-5 ma/V at 150-180V/6-8 mA. Input capacitance is higher than 12AU7 though. The 7044 looks like a great tube until you see the plate curves, not that great looking to me.

Single GM Delco 12AU7 [ECC82] - 100% Guaranteed Vintage Vacuum Tubes. Thousands in stock.

The 12AU7 is a double triode with separate cathodes. An amplification factor of 17 is quoted. The 6C4 is half of the 12AU7. The side view of the anode shows the ridges pressed into the sheet to aid rigidity. The coating helps improve radiation efficiency for better cooling.

It's nearly impossible to find such a stash of NOS European tubes these days! These are beautiful RFT of East Germany 12AU7/ECC82 vacuum tubes. These are highly underrated and are often compared to Telefunken for tone. These have short rounded gray plates similar to the typical 12AT7 plates which are quite rare.

2024年9月30日 · For Sale: 5 Telefunken 12AU7 tubes. Made in West Germany and of vintage manufacture. Excellent testing & great sounding tubes! Matching date codes (gc); July, 1956. All meet NOS spec for GM. Free from gas, leakage or shorts. Good Gm balance between sections. Voiced in preamp circuit. Quiet. No noise or microphonics. Clean pins/glass. Excellent ...

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This tube is a premium replacement for all 12AU7, ECC82, 5814, and 6189 types. Precision Testing & Matching Test Data on the Box Power Tubes: Checked for shorts, gas and leaks. Tested for and/or matched by Plate Current (Ip) and General Mutual Transconductance (Gm) at real world voltages on a Maxi-Matcher tube tester.

2011年10月19日 · "the 5814A is equivalent to a 12AU7WA, it is ruggedized and redesigned; the filament current raised to 175ma per section versus 150ma per section for a 12AU7. 5814A is computer rated, 5814WA is ruggedized "

The 12AU7 is a double triode with separate cathodes. An amplification factor of 17 is quoted. The 6C4 is half of the 12AU7. This exhibit has the white Brimar logo and 12AU7 has orange lettering. The two triode sections. Made in England and Brimar were part of the BVA (British Radio Valve Manufacturers Association.)