Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
All, I have a model 600A Tube tester from the estate that I was looking at. I haven't bought it yet. But was allowed to take it and look it over..
[Image: http://i292.photobucket.com/albums/mm38/...gd6cqo.jpg]
Looks good from outside.. But as I was checking some parts on inside I ran into something..
[Image: http://i292.photobucket.com/albums/mm38/...xxmhzv.jpg]
5 Resistors on a board.. Does any one know what values these are? Hard to follow schematic as it not clear..
This is what I get .. From left to right
Bottom to tap 958 Ohms Bottom to top 6644 Ohms
bottom to middle 25.5 Ohms bottom to top .58 Ohms Top to middle 25.6 Ohms..
That one makes no since at all I checked it 5 Times..
Next Bottom to top 1831 Ohms ( its marked 1800 Ohms)
1296 Ohms Should be 1200 Ohms..
Last 155.9 Ohms and .3MH
There is corrosion all over under chassis .. A fine white powder
Anyone restored this model??
Skip...
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Skip
I have 600A. The resistors are original.
Wirewound resistors don't change values. They either open or stay exactly where they were.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 94
Threads: 3
Joined: May 2010
City: Albuquerque, NM
Free downloads of Hickok data including schematics from this site.
http://www.stevenjohnson.com/hickok/data.htm
If you get the 600A be sure to check out the power cord. The wires inside the rubber jacket has a tendency
to crystallize the entire length of the cord. Replace with at least 16AWG.
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Thanks all, I will replace the electrolytic cap across the meter and the .1 cap , Replace the power cord.. Then try a power up. I will bring it up on a Variac..
Thanks all. Will let everyone know how it goes..
Skip...
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
I like that tester better than the TV-7 and I have both.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Well, Recaped.. Change line cord.. Powered up At 117 Volts draws .2 amps.. Checked the Type 83 and 5Y3 on my other tester both test good..
Tried first test setting the line voltage.. Meter reads nothing when P7 pushed
I measured pins 2 to 7 on octal socket for the Filament voltage.. Looked OK and was able to change it via the line adjust ..
Figured maybe the push buttons needed cleaning.. I did that now waiting for it to dry...
Any thing else I should look at .. I hope the Meter is not bad...
Skip...
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Meter could easily be checked, with a battery and a resistor, starting at say 10k and then observing the needle behavior.
Also they should put full deflection current on the meter so ypu know what voltage vs resistor to use.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Ok, I just tried the voltage tests.. The Filament is OK But when trying to read the Plate and others I get 0 volts..
Either all the push buttons are bad ( I doubt it) .. Hopefully not the Transformer..
I guess I will have to measure the voltage on the plates of the 5Y3 and 83 tube.. Then go from there.
Skip...
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Well, Stupid me.. I was on the wrong pins .. I do measure voltage according to the Calibration instructions.. They are off however.. since I cannot set the Line control correctly... NO reading on Meter..
Is there a easy way to check the meter?
Looking for a circuit that I can use to test meter?
Skip...
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
OK with help from Terry.. The meter is BAD .. Go figure.. Replacement meter is over 200.00 ..
Not for me..
Thanks to all for help with this..
Skip...
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Skip
1. Here's a Hickok meter for $99. It is not for 600A but maybe someone knows if it would do. Electrically I think it might be either fine as it is or with some adjustments , physically dunno.
http://www.ebay.com/itm/original-Panel-m...SwFNZWupDB
And here's a 600 using the same size(and likely the same) head.
http://www.jollinger.com/radio/misc/tube_testers.html
http://www.radiomuseum.org/r/hickok_600_...ester.html
2. A 600A is a fine instruments, bought mine close yo $400 and it's case is not that good looking. I still think it is worth every penny. If you can have a known good head for $200(negotiable?) it still might be worth it.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
(This post was last modified: 12-04-2016, 11:49 AM by morzh.)
Posts: 7,248
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
I have made up replacement meters for gear before if you can come up specs sometimes it's just a matter of changing out the movement and scale.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
The specs I think (at least what I used to see) with galvanometers are typically shown on the back.
In mA for full scale deflection.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Ok,, My 2nd goof.. Meter is Good.. I didn't disconnect the leads from it. After I did meter was OK.
But still will not read when P7 is pushed for the line adjust..
I tried to check backwards .. Checked the Switch, Pots in line Cleaned all pots .. I did notice that the Bias Fuse they call it should be a # 49 Lamp.. Mine has a #44 lamp in it..
The 49 lamp is a 2 volt .06A the #44 is a 6.3 Volt .25A The # 44 lamp is Good..
Would that cause the meter not to Read?? I would not think so... but cannot find anything else that would cause it not to read... Maybe I am missing something??
Only other thing I found was this..
[Image: http://i292.photobucket.com/albums/mm38/...xxmhzv.jpg]
5 Resistors on a board.. Does any one know what values these are? Hard to follow schematic as it not clear..
This is what I get .. From left to right
Bottom to tap 958 Ohms Bottom to top 6644 Ohms
bottom to middle 25.5 Ohms bottom to top .58 Ohms Top to middle 25.6 Ohms..
That one makes no since at all I checked it 5 Times..
Next Bottom to top 1831 Ohms ( its marked 1800 Ohms)
1296 Ohms Should be 1200 Ohms..
Last 155.9 Ohms and .3MH
Anyone have a layout of inside of this showing part layout??
Skip...
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Skip
They are likely what they show on the meter. Again, wirewound resistors rarely deviate much.
And if you have zero measurements they are not the likely culprit, they can distort the result but not to make it zero.
Round up the usual suspects. Check tbe tubes, voltages, switches.....
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Cannot Adjust an IF Transformer’s cores
|
Outstanding work indeed. I wish I could come up with solutions like this.slford310 — 11:16 PM |
Cannot Adjust an IF Transformer’s cores
|
The abilities of our 'Phorum Pholks" never ceases to amaze me! Fantastic fabrication, Joseph! I'm waiting now for...GarySP — 08:27 PM |
PT-6 antenna connections
|
Thanks. I never realized that was a notch noted in the schematic as described. I’ll recheck my wiring.bridkarl — 08:13 PM |
Cannot Adjust an IF Transformer’s cores
|
Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a ...jrblasde — 08:07 PM |
PT-6 antenna connections
|
Notice in the schematic the notch at the bottom of the antenna coil is between pins 3 & 4.
Yes, pin 6 of the 7C6 is...RodB — 07:34 PM |
bridkarl
|
I have two PT-6 chassis. On both there is a blue wire that runs from the above chassis transformer to pin 6 of 7C6. So t...bridkarl — 07:23 PM |
Cannot Adjust an IF Transformer’s cores
|
Joseph, now you are an engineer!!RodB — 06:37 PM |
PT-6 antenna connections
|
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM |
Cannot Adjust an IF Transformer’s cores
|
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM |
PT-6 antenna connections
|
I seem to have lost my way on this PT-6.
I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM |
Who's Online
|
There are currently no members online. |
|
![>](https://philcoradio.com/phorum/images/bootbb/asb/right_arrow.png)
|