Eico 666 el34 datasheet

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Title: KT77 Author: M-O Valve Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:04:08 PM EICO's best tube tester, a "Transconductance" tester. The Transconductance test is somewhat similar to a Mutual Conductance tester but uses AC voltages instead of DC and does not provide a direct Gm reading in Micromhos. The test provides the "Merit" of the tube under test with a percentage reading of the expected value.
 

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Very nice quality vintage 1960s Eico 666 Dynamic Tube tester with instruction manual and supplemental tube chart. It also includes the very extensive roll chart with hundreds and hundreds of tube parameters for testing. It is in complete and nice condition, always well protected with the heavy metal cabinet. Eico Hf-89 Tube Stereo Power Amplifier El34 Hf89: $679 Up for sale is an EICO HF-89 stereo tube power amplifier.This HF-89 was recapped a few years ago and is in great working condition.A copy of themanual is included.
 

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My recommendation for home testing: get a simple Emission tester like a B&K DYNA-JET, Heathkit, Eico or other NON-Gm tester. They are simple to use, stable, accurate and relate well to the life remaining in your tubes. Buy your tubes from someone who certifies their specs to be proper when new. I strongly disagree with this, thinking the EL34 is one of the most musical tubes out there, walking a fine line between a triode romance and warmth, and the more dynamic sound of the 6550. The Shuguang "B" version of the EL34 is the stock tube in countless amplifiers and has been labeled Ruby, Valve Art, and who know what else.

Eico 667 Schematic. Here is the schematic from the Eico 667 tube tester. It is very similar to the 666, except now there are a pair of extra levers, and a few test sockets are missing. But the meat and potatoes are identical. If you are planning to restore your 667 to peak operating condition, here are a few pointers. Eico Hf-89 Tube Stereo Power Amplifier El34 Hf89: $679 Up for sale is an EICO HF-89 stereo tube power amplifier.This HF-89 was recapped a few years ago and is in great working condition.A copy of themanual is included. OUTPUT PENTODE Output pentode roted for 2SW onode dissipotion, intended for use in a.c. mains operated equiPment. OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL Distributed load conditions with screen-grid tapping at 43% of primary turns 430 1 425 2 x 62.5 2x65 2x5.0 2x5.1 470 32 6.6 20 0.8 430 1 425 2 x 62.5 2x70 2x5.0 2x7.5 470 52 6.6 37 1.3 v

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I usually refer to the Coletronics chart for the 666 as a starting point, but I also check the settings as shown in the Eico charts too. You can find the Coletronics chart in the archives that Ian mentioned above. Photograph 2: Inside View - EICO 667 Tube and Transistor Tester. The EICO 667 is basically the same as the 666 Model, so the information here generally applies equally. These testers are, unlike say the EICO 625 and EICO 628 tube testers, capable of true dynamic conductance testing rather than simple emission testing. Emission testing will tell ...