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 Post subject: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 5:27 am 
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Joined: Mar Sun 25, 2018 10:50 pm
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Location: 07960
I have a B&K 550 tube tester, which unfortunately can't test the box of Type 45 and Type 26 tubes I just saved from the trash bin. Could an adapter be fashioned that would allow me to test these on the 550?


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 12:40 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
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Location: Sunbury, Ohio 43074
It appears that it would be difficult to figure out an adapter for this. It was discussed in the old thread below, but not specifically for your tubes. There was a version, or an addition, that added a switchable adapter in the lid, so theoretically you could make a socket adapter that would convert your tubes to an octal base and at least get the pins switched where they need to be, but what the readings for a good/bad tube would be? Anyone's guess, although you might be able to figure it out using the tube data charts.

viewtopic.php?t=63998

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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 1:37 pm 
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Joined: Sep Tue 30, 2014 6:08 am
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Location: Norfolk, VA
IIRC, the filament supply for the 550 is limited to 600mA - those 45's draw 1.4A, and would need a separate supply.

The 550, like the 600, 650, 700 and 707, were designed around TV service use. The Dyna-Quik testers all facilitated a quick testing of TV tubes, with the smaller testers like the 600 touted for service call use. We had a 600, later a 707, and in '82, got a 747. B&K had a trade-up program with the 747 - our Sencore TC154 portable tester got a $45 discount.

B&K was not known for older tube testing support after 1964 or so. I can't recall a single B&K tester that came equipped with the older and newer sockets. The 610 panel for the 500 added only the loctal socket - 4 pin support was still limited by filament current.

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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 1:41 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
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Location: Sunbury, Ohio 43074
pffff... I neglected the filament current issue. The socket adapter for the 550 however does have octal, loctal, 7 and 9 pin sockets so at least that part would work :)

Time to buy an older tube tester I guess :):

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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 1:43 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
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Location: 07960
Thanks Barry. I do have the 610 adapter in the lid, so that gets me one step closer. But your point about interpreting readings makes me wonder if it would be worth trying to fashion a socket adapter. That said, even though I'm a relative tube newb, I'm for up for the challenge if you guys are willing to offer guidance.


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 1:45 pm 
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Just saw Brian's reply. That settles it. Thanks guys.


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 3:46 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Stafford, Texas USA
It would be difficult to figure out an adapter for this, but it can be done.

Brian were do you get that the filament supply for the 550 is limited to 600 mA .

It will test a 5U4 and that a 3 amp filament.

Jimmie


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 5:05 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 677
Location: Stafford, Texas USA
Al
I think I have it figure out.
How does your 610 plug in or was it wired in to 550?

Read how the 610 is installed in a B&K 500.
http://bama.edebris.com/manuals/b&k/610/

The 610 in some 550 they wire the test socket and some rewired the 35z4 socket.

That socket has all the signals that you need.

Does your data book have the setting for a 6B4 on the 610; this is starting to build an adapter and the setting's for 45 and 26.

Jimmie


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 6:11 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
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Location: 07960
My 610 plugs into the rewired socket #47 on the panel, which has 35Z5 printed next to it. And yes, the tube chart lists 6B4 as testable with the 610.


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 9:10 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
Posts: 201
Location: 07960
Jimmie Stewart wrote:
Al
I think I have it figure out.
How does your 610 plug in or was it wired in to 550?

Read how the 610 is installed in a B&K 500.
http://bama.edebris.com/manuals/b&k/610/

The 610 in some 550 they wire the test socket and some rewired the 35z4 socket.

That socket has all the signals that you need.

Does your data book have the setting for a 6B4 on the 610; this is starting to build an adapter and the setting's for 45 and 26.

Jimmie


Thanks for the assist Jimmie.

So do I need to put together an 8 pin to 4 pin adapter to plug into the 610?


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 11:25 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Stafford, Texas USA
First what the set up data for the 6B4 on the 610?

The 6B4 is an octal based triode with a 5S base diagram, same as a four pin 6A3 triode with a 4D base diagram.
The 26 and 45 are both triodes with a 4D base diagram.

So the adapter is:
Octal 5S base diagram plug pin 2 to 4pin 4D base diagram socket pin 1 filament
Octal 5S base diagram plug pin 7 to 4pin 4D base diagram socket pin 4 filament
Octal 5S base diagram plug pin 3 to 4pin 4D base diagram socket pin 2 plate
Octal 5S base diagram plug pin 5 to 4pin 4D base diagram socket pin 3 grid

MAKE SURE THAT YOU SET THE FILAMENT VOLTAGE FOR THE 26 TO 1.5 VOLTS
MAKE SURE THAT YOU SET THE FILAMENT VOLTAGE FOR THE 45 TO 2.5 VOLTS

The set up data for the 45 will be close to the 6B4 data.
The set up data for the 26 will be????

Jimmie


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Mon 25, 2019 11:38 pm 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 4780
Location: Norfolk, VA
Jimmie Stewart wrote:
It would be difficult to figure out an adapter for this, but it can be done.

Brian were do you get that the filament supply for the 550 is limited to 600 mA .

It will test a 5U4 and that a 3 amp filament.

Jimmie


It's a note that came with our 600 tube update listing - basically, it explained why some 33-volt filament tubes were tested at a lower voltage (30V) while still others were tested at 35 Volts, to limit the current in the transformer to 18VA total. (30V x 600mA = 18VA...). The concern was also placed on a Horizontal Output tube (42KN6) that drew 400mA at 42V (16.8 VA) - it was tested at 35 Volts instead of 40 Volts.

Yes, a 5V rectifier, at 3A, would draw 15VA from the transformer, so yes, at lower voltages, more current can be drawn. Note that the note is for the 600, not the 550.

Thanks for pointing that out and correcting things!
:D

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"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Tue 26, 2019 12:12 am 
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Joined: Mar Sun 25, 2018 10:50 pm
Posts: 201
Location: 07960
Excellent, thank you!

Here's the set-up data for the 6B4 on the 610:

Heater: 6
Sensitivity: 70

A; 2
B: 5
C: 0
D: 0
E: 7
F: 3
G: 0
H: 0
J: 3

Test Position: 1

Regarding the set-up data for the 26, would the schematic for the 610 help to figure that out? (Unless you already have a copy.)


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Tue 26, 2019 11:33 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 677
Location: Stafford, Texas USA
Regarding the set-up data for the 26, and 45 the 610 setup is the same as the 6B4.

The change is on the 550 the heater has to change and the sensitivity may have to be changed.

Jimmie


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 Post subject: Re: B&K 550 adapter?
PostPosted: Feb Tue 26, 2019 1:18 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
Posts: 201
Location: 07960
Got it.

I'm looking at picking up this adapter from Angela.

https://www.angela.com/octal8pinbottomt ... erkit.aspx


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 Post subject: Re: B&K 550 adapter?
PostPosted: Mar Sat 02, 2019 8:44 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
Posts: 201
Location: 07960
Ok, I have the adapter top and bottom. Having never soldered anything to tube pins, I'm wondering what methods folks use/recommend. My thought was to create a little pool of solder inside the pin, tin the wire, heat the pin again to liquify the solder inside, and then insert the tinned wire.

Image

Image


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 Post subject: Re: B&K 550 adapter?
PostPosted: Mar Mon 04, 2019 3:20 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
Posts: 201
Location: 07960
Bump for any input.


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 Post subject: Re: B&K 550 adapter?
PostPosted: Mar Mon 04, 2019 4:02 pm 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 4780
Location: Norfolk, VA
Al,

Definitely clean and pre-tin the leads with solder before inserting them into the tube base. Use lots of flux and add solder to the pin until it wants to bulge out the tip end of the pin. Make sure you don't have spillage within the base.
Don't move it while it cools, and trim away any excess lead length and solder once it completely cools.

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"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: B&K 550 adapter?
PostPosted: Mar Mon 04, 2019 5:32 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
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Location: 07960
Will do. Thanks Brian.


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 Post subject: Re: B&K 550 adapter?
PostPosted: Apr Fri 19, 2019 4:59 pm 
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Joined: Mar Sun 25, 2018 10:50 pm
Posts: 201
Location: 07960
Jimmie Stewart wrote:
Regarding the set-up data for the 26, and 45 the 610 setup is the same as the 6B4.

The change is on the 550 the heater has to change and the sensitivity may have to be changed.

Jimmie



After a bit of a delay, I have the adapter wired up.

For the heater settings, the B&K 550 manual says that they roughly correspond to the filament voltage for tubes with the corresponding first number, e.g. Heater setting 3 is for 3.15 filament voltage tubes. So I should be using Heater setting 1 for the 26 (1.5V filament voltage) and 2 for the 45 (2.5V filament voltage)? I've tested one 26 and one 45 this way, and neither lit up , which is why I'm asking. Also, how to figure out the right sensitivity? Just slowly turn the dial until I get a response?


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