philips: 161U - Brimistor, Varistor or Varite in AC/DC re
? philips: 161U - Brimistor, Varistor or Varite in AC/DC re
Gentlemen,
With specific reference to the excellemt 2006 forum posts about the items above. . . . .
I have recently acquired the Philips GB Service manual for the radio in question; and would like comments to clarify which specific part would be the replacement for items R5 and R19 in the power supply of the receiver.
The tube lineup consists of the 100mA series tubes.
However, the parts list only shows the following numbers 49.379.62 for "resistor" R5 and 49.379.67 for "resistor" part R19 - and they are identified as "Varite".
There are no values provided for the resistance or wattage or tolerances - would it be permissible to use the BRIMISTOR data to presume the appropriate replacement as equivalent to the CZ3?
Respectfully,
Robert
NOTE: I ask this question based upon substitution of the C1 regulator in my early Philips AL161 AC/DC receiver from Argentina
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Roberts
Hi Robert, I missed here in the forums to state a premium, jajaj, wanted to take this opportunity to greet this new year and all your wishes come true having a big year.
Solve the problem of your mail or has a new address ...? , I wrote a couple of chances and I did not get any contestacón is always pleasant to be in communication with you and if you need something let me know .- Argentina
My best regards
Respectfully
Carlos Landi
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Varite (thermistor) for Philips 161U
Hello Robert,
I know the resistance value of one of the varites in your 161U radio, R19 part number 49.379.67 is 10k ohms when cold and 250 ohms when hot. Alternative but redundant parts to the Philips were the Mullard VA1010 or the Radiospares TH6 thermistors. I have no information on the other one unfortunately. It's not a good idea to replace these with a fixed value resistor.
Finding data on Philips thermistors is difficult, and spare new old stock examples are virtually non-existant in the UK now but I might be able to obtain a used working 49.379.67 varite for your radio, and the other one too if someone can supply its characteristics, as I know of a good source of secondhand parts here.
If you can find a Brimistor to match the original Philips then use it ..... and let us know if you're successful.
Regards ........ Howard
.
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? What is the British 'Varite' part?
Hello Howard,
I do NOT have the receiver - just the complete Service manual. . .my question was asked to determine if the "Varite" was a voltage dependent resistor or the temperature coefficient resistor (either positive or negative influenced), or something like a ferrite bead?
Also, if the restorer found a defective R5 or R19 "resistor" in the radio (sometimes mounted like a cylinfrical fuse) what ratings would he use in lieu of the part number for replacement purposes?
Respectfully,
Robert
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? Philips Varite part numbers - or Mullard
Hello Howard and Carlos,
Thank you so much for helping me to resolve the "mysterious" part number to specific component dilemma
Although I have not yet located a Philips GB-produced document to specifically identify the Varite resistors used on their model 161U receiver, I have recently acquired an excellent 8-page document MK/116 Ed. 1 BRIMISTORS produced by Standard Telephones and Cables Limited - STC published in 1958 - which offers a complete discussion of Characteristics and Operation of Brimistors.
The technical data expands upon that which was proffered by Mr John Turill, and discussed by several other members to differentiate between the various "regulating resistors" and the method of regulation.
Please refer to the Forum postings: Some thermistor data which is found in the Repair and Restauration: Tips and Tricks. . . . . .
The attached STC Brimistors brochure provides an excellent Table of Data for three styles of the Brimistors available as of 1958 from STC - the Types listing identifies three outlines to the C-series from CZ1 through CZ12A
Respectfully,
Robert
- STC Brimistors brochure (70 KB)
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This thread was moved automatically.
NTC-Resistor
Hallo Robert,
these are very normal 100mA NTC-resistors.
Regards WB.
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This thread was moved back manually because it received a valid answer.
Semantics or Terminology or Hersteller
Hello Wolfgang,
Thank you for the clarification that these are the Negative Temperature Coefficient (NTC) type resistors?!
After reading your referenced article, I understand the Brimistors to be the same as NTC resistors. In fact, identical to the "negativem Temperatur-koeffizienten" widerstand, but I was unsure of the current rating - from either the milliamps or more typical rating in Watts or portions thereof.
Respectfully,
Robert
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NTK / NTC
This is correct, it is a negative-temperature-coefficient resistor (NTC).
Also look for this post, unfortunately for you in German ==>NTK, Materialien und Funktion.
Best regards WB.
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Philips 'NTK / NTC' - Widerstände open text
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Many Thanks - Other Comments
Hello Thomas,
Thank you so much for the "open text" of the Philips NTK/NTC resistors. . . .I was able to understand much of the article without the Babelfish translation. However, this will make it even cleared to me. I have been using the translater since I joined in 2003!
I am seriously considering another topic to submit to the more senior radio engineers as it relates to the "peculiar" B+ power supplies of the early SABA Villingen and Waldbad models which vacillated from a tube rectifier to the solid state diode (or diodes) and then back to the EZ80 tube. I am aware that some methods avoid the center tapped secondaries in favor of an "end tapped circuit" with both plates on the same end, but it does not seem to be used commonly in the "higher priced" SABA models!
I have followed several forum postings of the these models - although I do not own one of these models. I have been reviewing 7 or 8 schematics trying to arrive at a plausible explanation!!
Respectfully,
Robert
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