Ready to restore and calibrate your B&K 747 tube tester? Is your old phenolic PCB warped, with traces cracked and caps leaking? Carbon resistors have drifted to some mystery value? I have the perfect setup for you! I wanted to make repairing or restoring the 747 as easy as possible while increasing reliability, serviceability and repeat-ability and this kit hits all the marks. This kit was designed for the 747B however it will work in the 747.

Parts depend on how you order. Due to customers needing different things, choose what you like in the drop down above!

• Bare PCB is just that. A PCB with no BOM

• PCB with BOM comes with a detailed list and hyperlinks to the items we use so you can order all of the parts yourself (we take no responsibility for parts going obsolete or out of stock in which case you will need to find a sub)

• Pre-built / assembled PCB without gold quick connect contacts. Comes with all high grade resistors, caps and components with tighter tolerances, higher temp specs and overall, drastically more reliable hardware. Only the best parts used. All wires need to be direct soldered to the PCB

• Pre-built / assembled PCB with gold quick connect contacts. Comes with all high grade resistors, caps and components with tighter tolerances, higher temp specs and overall, drastically more reliable hardware. Only the best parts used. You solder all wires to a female pin which will mate to a male quick connect pin on the PCB. Extra gold pins provided for the shorts neon bulb. The quick connect option makes removing the PCB for future work a job that takes just a couple minutes

What you need from your old tester:

• Reuse your original bayonet sockets and #55 bulbs. If your bulbs are questionable, source only NOS #55 bulbs for replacement (make sure to clean the bulbs and sockets properly)
• Reuse the 3K 1.5W wire wound - metal cased trimmer from your original PCB. These are almost never bad, so clean properly and install (we do have a new production option at additional cost)
• Reuse 10K and 2M thumbwheel trimmers (we do have new production options at an additional cost) These also are almost never bad

• This is a component level parts kit only. Switches, levers, potentiometers, meter, tube sockets, transformer, front panel, case and so forth are not included - these parts come from your tester (have to say it as someone will ask)
• This kit DOES replace the terminal strip PCB under the primary PCB! I added all components to the main PCB for easy installation

Skill level of the kit:

• This kit is for experienced electronic techs with restoration experience
• If you have not worked with high voltage AC electronics, DEATH by electrocution is highly possibly when calibrating after installation (do not leave the unit plugged in when installing)
• For an experienced tech, the kit takes about 2 hours to complete or less. This includes removing the old PCB and installing everything new

What we recommend:

• We recommend you start with a known working B&K 747
• We recommend SAFE working conditions
• We recommend a good soldering iron / station with quality solder
• We recommend all contacts and wire wound trimmers be cleaned with Deoxit D5 prior to installation
• We recommend you have adequate knowledge of electronic restoration prior to installing this kit!

We are not responsible for:

• Cooking or killing yourself during calibration because you really do not know what you are doing. We have plenty of warnings - experienced techs only!
• Frying your tube tester. This kit works flawlessly and has been proven to be a direct replacement. You goof it up - it is on you
• You are retrofitting new parts into an antique piece of equipment. Old things have a habit of crapping out such as transformers and meters. In short, there is no warranty on our parts kit. Pay attention to your installation and you will be up and rocking in no time!

Yes, we can install this kit for you as well as clean and calibrate your tester for an additional cost + shipping. Just shoot us a message!

*****New version of the master kit - now more affordable!*****
Several of the original components of this calibration kit went "end of life". I designed up this new kit to replace my previous. In doing this, I was able to reduce cost a bit but provide a better kit overall. We now offer just a single kit that covers the 700, 707 and 747 | 747B

Calibration instructions are available for the B&K700, 707 and 747 with this kit. You can also find these instructions in the manual section of our site.



This kit covers calibration parts for the B&K 700, 707 and 747 (master kit):

• 1uF 400V Film capacitor
• 10K Dale wirewound 5w 1% resistor (use this over the 6K advised in the 700/707 manual)
• 1Mohm Vishay 1% resistor
• 20Mohm Vishay 1% resistor
• 100Mohm Ohmite 2% resistor
• 2qty Straight ground pin with loop

All pins come pre-soldered with machine turned gold contact pins to prevent tube socket damage

Skill level:

• This kit is for experienced electronic techs with restoration experience
• If you have not worked with high voltage AC electronics, DEATH by electrocution is highly possibly when calibrating

What we recommend:

• We recommend you start with a known working tube tester
• We recommend SAFE working conditions
• We recommend all contacts and wire wound trimmers be cleaned with Deoxit D5 during restoration
• We recommend you have adequate knowledge of electronic restoration prior to installing this kit!

We are not responsible for:

• Cooking or killing yourself during calibration because you really do not know what you are doing. We have plenty of warnings - experienced techs only!
• Frying your tube tester. These parts work perfectly. You goof it up - it is on you