MDB Ventures Vacuum Tube and Related Information


MDB Ventures Home


MDB Ventures offers vaccum tubes and other items for sale. We also provide free helpful information related to vacuum tubes that can be downloaded from this site. To see a description of the information available, click on one of the name links below. After you've read the description, if you want to download a copy of the file, just click on the filename.



Vacuum Tube Information from MDB Ventures


Information on Tube Transconductance (Mutual Conductance)
transconductance.pdf
Bytes: 5,473,502, Date: 194?
Click on a filename above to download the file

This file contains information on tube transconductance. How it is computed and how it is used. It is one of the best descriptions around. It is simple and doesn't get very deep into the math. It is an old 1940s Bell Labs document written by T. Slonczewski.

Keywords: TUBE TRANSCONDUCTANCE MUTUAL CONDUCTANCE BELL

Go back to the TOP


Information on Tube Measurements and Tube Tester Results
mutualconductance.txt
Bytes: 10862, Date: 21 May 2013
Click on the filename above to download the file

This file contains information on tube measurements, including mutual conductance, grid voltage, plate resistance, plate current and plate voltage. This is primarily a description of the underlaying physical aspects of the tube and how it works. The text only very lightly touches on the math. If you know Ohms law you will be perfectly comfortable reading this artical.

Keywords: TUBE MUTUAL CONDUCTANCE TRANSCONDUCTANCE PLATE RESISTANCE CURRENT

Go back to the TOP


Information on Testing Photodiode Tubes
photodiodetesting.txt
Bytes: 5280, Date: 25-MAY-12
photodiodetesting.jpg
Bytes: 22297, Date: 25-MAY-12
Click on a filename above to download the file

These two files contains information on how to test photodiode tubes as well as photoresistors and solidstate photodiodes. The text file describes how to perform the test, the second file shows the schematic.

Keywords: TUBE PHOTODIODE PHOTORESISTOR PHOTOCELL

Go back to the TOP


80/5Y3/5Z3/5U4 Fullwave Rectifier Tube Description and Replacement
fullrect.txt
Bytes: 32442, Date: 2-Nov-07
Click on the filename above to download this file

This file is a description of the common 80, 5Y3, 5Z3 and 5U4 type fullwave rectifier tubes. It also describes when and how you can substitute the tubes with other common varieties and how to replace them with solidstate diodes.

Keywords: FULLWAVE RECTIFIER TUBE

Go back to the TOP


Amphenol Magic Eye Assemblies
meyea.jpg
Bytes: 442083, Date: 30-Nov-04
Click on the filename above to download this file

This file is a one page ad for the Amphenol magic eye tube mounting assembles It includes a detailed description of the assemblies and example diagrams for wiring eye tubes into existing circuits.

Keywords: AMPHENOL MAGIC EYE TUBE ASSEMBLY

Go back to the TOP


Replacing Magic Eye Tubes
eyeswap.txt
Bytes: 6560, Date: 1-Nov-07
Click on the filename above to download this file

This is a short text file that describes how to replace certain magic eye tubes with other similar magic eye tubes.

Keywords: REPLACE MAGIC EYE TUBE

Go back to the TOP


Magic Eye Tube Numbers
eyetubes.txt
Bytes: 247, Date: 30-Nov-04
Click on the filename above to download this file

This file contains a list of magic eye tube numbers.

Keywords: MAGIC EYE TUBE NUMBERS

Go back to the TOP


RCA UY-227 Information
rca27a.jpg Data Sheet
Bytes: 139637, Date: 30-Nov-04
rca27b.jpg License
Bytes: 112532, Date: 30-Nov-04
Click on a filename above to download the file

These two files are from a data sheet included in a RCA UY-227 globe tube box. The first is the data sheet for the tube. The second is the license agreement. Yes, you had to open the package to read the agreement. Sound familiar?

Keywords: RCA UY-227 GLOBE TUBE DATA

Go back to the TOP


Common Cathode Dual Triodes
cc2tri.txt Common Cathode Dual Triodes
Bytes: 2065, Date: 25-Jan-08
Click on a filename above to download the file

This text file is a summary of the various common cathode dual triodes produced.

Keywords: COMMON CATHODE DUAL TRIODE

Go back to the TOP


Tripple Triode Substitution
tripple.txt Replacing Tripple Triode Tubes
Bytes: 9326, Date: 26-April-17
Click on a filename above to download the file

This text file describes alternate solutions to replacing tripple triode tubes.
The file was updated on 26 April 2017.

Keywords: TRIPPLE TRIODE TUBES 6C10 6K11 6Q11

Go back to the TOP


A listing of the various triode/pentode tubes
triodepentode.txt A listing of the various triode/pentode tubes
Bytes: 26837, Date: 27-April-17
Click on a filename above to download the file

This text file contains a listing of the various triode/pentode tubes.
The file was updated on 27 April 2017.

Keywords: TRIODE PENTODE TUBES 6GH8 6AN8 6U8 ALL

Go back to the TOP


What Are Grid Clips?
gridclip.txt Grid clips and microphonics suppression
Bytes: 2065, Date: 25-Jan-08
Click on a filename above to download the file

This text file is a description of grid clips and how they supress microphonics.

Keywords: GRID CLIP CLIPS MICROPHONICS SUPRESSION

Go back to the TOP


Burroughs Nixie Tube Information
bnixie.zip Burroughs Document on Nixie Tubes
Bytes: 4,422,046, Date: 2-Oct-08
Click on a filename above to download the file

This is a zip file containing eight pages (JPG format) from a Burroughs document about their Nixie tubes including, data, characteristics and circuit designs.

Keywords: BURROUGHS NIXIE TUBE DATA

Go back to the TOP


Burroughs B7971 Tube Information
b7971.zip Burroughs B7971 Documents
Bytes: 865,741, Date: 2-Oct-08
Click on a filename above to download the file

This is a zip file containing four pages (JPG format) from Burroughs documents about their B7971 Nixie tubes.

Keywords: BURROUGHS B7971 NIXIE TUBE DATA

Go back to the TOP


Burroughs B7971 Circuit Schematic
b7971-brd.png Burroughs B7971 Circuit Schematic
Bytes: 150,839, Date: 28-Oct-09
Click on a filename above to download the file

This is a png file containing the schematic of the stock quote circuit board. Sorry about the poor quality, it is all we have. It is a high resolution scan of a copy of a copy of a copy of a....

Keywords: BURROUGHS B7971 NIXIE TUBE BOARD SCHEMATIC

Go back to the TOP


A long and rambling history of the 6SN7 and its successors
hist6sn7.txt 6SN7 History
Bytes: 13,730, Date: 2-Oct-08
Click on a filename above to download the file

This is a text file containing a long and rambling history of the 6SN7 and some of its successors as well as a side trip to design issues such as getters.

Keywords: 6SN7 TUBE HISTORY GETTERS

Go back to the TOP


Low Voltage Space Charge Tubes
spacecharge.txt Low Voltage Space Charge Tubes
Bytes: 10,644, Date: 30-Nov-08
Click on a filename above to download the file

This is a text file containing a discussion about low voltage space charge tubes. Low voltage space charge tubes are tubes that can operate at "safe" voltages (30 volts or less).

Keywords: SPACE CHARGE LOW VOLTAGE TUBE HISTORY

Go back to the TOP


Vacuum Tubes for Battery Radios
batradio.txt Battery Radio Vacuum Tubes
Bytes: 10,596, Date: 25-Jun-09
Click on a filename above to download the file

This is a text file containing a discussion about tubes used in battery powered radios. A list of the common battery radio tubes is provided.

Keywords: BATTERY RADIO VACUUM TUBE

Go back to the TOP


Everyready 1954 Radio Battery Guide - Large format
batteries-e.zip Everyready 1954 Radio Battery Guide - Large format
Bytes: 2323KB, Date: 12-Apr-15
Click on a filename above to download the file

This is a zip file containing a scan of the 1954 Everready Radio Battery Guide for battery powered radios. This is a large format scan.

Keywords: BATTERY RADIO VACUUM TUBE

Go back to the TOP


Everyready 1954 Radio Battery Guide - Small format
batteries-s.zip Everyready 1954 Radio Battery Guide - Small format
Bytes: 810KB, Date: 12-Apr-15
Click on a filename above to download the file

This is a zip file containing a scan of the 1954 Everready Radio Battery Guide for battery powered radios. This is a small format scan (half the size of the large format).

Keywords: BATTERY RADIO VACUUM TUBE

Go back to the TOP


Everyready 1954 Radio Battery Quick Guide
batteries-x.jpg Everyready 1954 Radio Battery Quick Guide
Bytes: 169KB, Date: 12-Apr-15
Click on a filename above to download the file

This is a jpg file containing a small format scan of the 1954 Everready Radio Battery Quick Guide for battery powered radios. This is a small format scan of the last page of the Everready Radio Battery Guide which contains a summary of the full radio battery guide.

Keywords: BATTERY RADIO VACUUM TUBE

Go back to the TOP


Voltage Regulator Tubes
voltreg.txt Voltage Regulator Tubes
Bytes: 16,325, Date: 15-Apr-13
Click on a filename above to download the file

This is a text file containing a discussion about voltage regulator tubes. A list of the common voltage regulator tubes is provided.

Keywords: VOLTAGE REGULATOR TUBE

Go back to the TOP

#6GE8ADPT"> 6G11 to 6GE8 Adapter - How to use a 6G11 in place of a 6GE8


6G11 to 6GE8 Adapter
6g11-6ge8-adapter.txt How to use a 6G11 in place of a 6GE8
Bytes: 431, Date: 6-May-13
Click on a filename above to download the file

This is a text file describing how to build an adapter to use a 6G11 compactron tube in place of a 6GE8 tube.

Keywords: VOLTAGE REGULATOR TUBE

Go back to the TOP



Tube Tester Information from MDB Ventures


Superior Model 820 Tube setup charts
super820.zip
Bytes: 626265, Date: 30-Nov-04
Click on the filename above to download this file

This is a zip file containing ten pages of tube setup charts for the Superior model 820 tube tester. It also includes a page describing how to use the crt test adapter with the model 820.

Keywords: SUPERIOR 820 TUBE TESTER CHARTS

Go back to the TOP


Jackson Model 648R Schematic
j648r.gif
Bytes: 541659, Date: 30-Nov-04
Click on a filename above to download the file

This file contains the schematic for the Jackson model 648R Tube Tester.

Keywords: JACKSON 648 TUBE TESTER SCHEMATIC

Go back to the TOP


Buying, Restoring and Calibrating the Eico 666/667 Tube Tester
This file describes what to look for when buying an Eico 666 or 667 tube tester, how to restore them and how to calibrate them.
It also includes some simple modifications that can be done to improve the reliability of the tester.

restr666.txt
Bytes: 32764, Date: 31-May-13
666-667-mod.png
Bytes: 18280, Date: 31-May-13
Click on the filenames above to download the files

This file contains information on buying, restoring and calibrating the Eico 666 and 667 Tube Testers.

Keywords: Eico 666 667 TUBE TESTER BUY CALIBRATE MODIFY

Go back to the TOP


Testing Tubes Using the Eico 666 Tube Tester
eicotesting.txt
Bytes: 21247, Date: 20-Feb-11
Click on a filename above to download the file

This file contains information about testing tubes with the Eico 666 and 667 Tube Testers.
How to verify existing test setups and how to create your own.

Keywords: Eico 666 667 TUBE TESTER

Go back to the TOP


Setup Chart 666-05A (Annotated) for the Eico 666 Tube Tester
Eico666chart-05-annotated.zip
Bytes: 2154663, Date: 7-Apr-17
Click on a filename above to download the file

This file contains my annotated 666-05 setup chart for 666/667 the Eico 666 and 667 Tube Testers.
Note: this is a photocopy of my chart, so it is a bit hard to read is some areas.

Keywords: Eico 666 667 TUBE TESTER 666-05A SETUP CHART ANNOTATED

Go back to the TOP


Radiart 1945 Vibrator Replacement Handbook
vibrators.pdf
Bytes: 4,919,296, Date: 24-NOV-14
Click on a filename above to download the file

This file contains information on radio vibrators, their operation and their replacements.

Keywords: RADIO VIBRATOR OPERATION REPLACEMENT

Go back to the TOP


Transformer Wiring Color Codes
transformer.txt
Bytes: 874, Date: 2-JUL-07
Click on a filename above to download the file

This file contains information on transformer wiring color codes.

Keywords: TRANSFORMER COLOR CODE

Go back to the TOP


Ballast Resistor Identification Codes
ballast.txt
Bytes: 2630, Date: 2-JUL-07
Click on a filename above to download the file

This file contains information on ballast resistor identifier codes.

Keywords: BALLAST RESISTOR TUBE CODE

Go back to the TOP


How to Drive a 12.6V Heater From a 6.3V Supply
heaters.txt
Bytes: 4410, Date: 11-MAR-08
Click on a filename above to download the file

This file contains information on how to build a voltage doubler to drive a 12.6V tube heater from a 6.3V filament supply.

Keywords: TUBE FILAMENT POWER SUPPLY DOUBLER

Go back to the TOP


Hearing Aid Batteries
hearingaidbatteries.txt
Bytes: 10,596, Date: 10-Oct-08
Click on a filename above to download the file

This is a text file containing a discussion about hearing aid batteries. A list of the common battery types is provided.

Keywords: BATTERY HEARING AID

Go back to the TOP


Ceramic Capacitor Problems
mlcc-caps.txt
Bytes: 4556, Date: 17-May-14
MlccCapLossVsTime.png
Bytes: 35257, Date: 6-Ovct-2016
Click on a filename above to download the file

This is a text file containing a discussion about problems with ceramic capacitors.

Keywords: MLCC CERAMIC CAPACITOR PROBLEMS

Go back to the TOP



Gmail Users
Please read this note about incorrectly declared email as spam.
This can be an issue as well with other free email providers like Hotmail, AOL, and Yahoo.



Go back to the TOP
MDB Ventures Home

Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com