http://www.vishay.com/docs/63006/hmetlab.pdf
Apparently:
A further enhancement in both short and long term stability is
achieved by oil filling. The oil also acts as a thermal conductor
allowing the device to accept short periods of overload without
degradation..
Fair enough, Makes sense! 😛
With accuracies of ± 0.001% and a resistance range from
5 ohms to 1.84 megohms and long term shelf life of less than
5ppm.
Oil-filled, tinned copperleads, tinned brass shell, kovar and glass
end bells.
What would you guy's think the life span of these types of resistors?
Could these just be another "Flash for gold" rediculously expensive resistors?
If they were used in an audio stage would the stability transform into rediculously precise and maybe 'tight' response?
I would say someone will try em in audio equipment sometime as they are used for lab equipment.. and some ppl have $$$.
What do you guy's think about the quote: The most precise and stable resistors available.
Cheers.
Apparently:
A further enhancement in both short and long term stability is
achieved by oil filling. The oil also acts as a thermal conductor
allowing the device to accept short periods of overload without
degradation..
Fair enough, Makes sense! 😛
With accuracies of ± 0.001% and a resistance range from
5 ohms to 1.84 megohms and long term shelf life of less than
5ppm.
Oil-filled, tinned copperleads, tinned brass shell, kovar and glass
end bells.
What would you guy's think the life span of these types of resistors?
Could these just be another "Flash for gold" rediculously expensive resistors?
If they were used in an audio stage would the stability transform into rediculously precise and maybe 'tight' response?
I would say someone will try em in audio equipment sometime as they are used for lab equipment.. and some ppl have $$$.
What do you guy's think about the quote: The most precise and stable resistors available.
Cheers.
Well, it depends. If you've designed an amp so badly that you thermally stress the resistors, you might achieve better stability and reliability with these. OTOH, it might be better and more economical to not stress the resistors or just use resistors of a higher power rating. I can't think of too many audio applications which require 0.001% accuracy (as opposed to tracking between two different resistors- and even then...).
That won't stop someone from marketing these to audio geeks as a luxury component that "sounds" better.
That won't stop someone from marketing these to audio geeks as a luxury component that "sounds" better.
tempcotempotempcotempcotempcotempcotempco
Sigh..............
They were never intended for audio so stop complaining about what they cost. I have stated at least a dozen times what the important specs for resistors are and it goes in one ear and out the other. The sonics of resistors and some of the betters sounding types have been know for over twenty years. I think you will find the resistors here are special order with a minimum quantity. Don't get annoyed if you get no response. I have used some Vishay resistors that were hermetically sealed and used a silicone paste for heat transfer to a T03 package. These were used for emitter resistors and sound absolutely great. I got them surplus. New they are special order and about 40 bucks a piece.
I understand how people cannot be up on the very latest when it comes to parts, but 20 years behind; on something that has been discussed many times on the forum and which can be researched by reading a few magazines, manufactures literature, and audio parts catalogues....... well I just don't get it.
Sigh..............
They were never intended for audio so stop complaining about what they cost. I have stated at least a dozen times what the important specs for resistors are and it goes in one ear and out the other. The sonics of resistors and some of the betters sounding types have been know for over twenty years. I think you will find the resistors here are special order with a minimum quantity. Don't get annoyed if you get no response. I have used some Vishay resistors that were hermetically sealed and used a silicone paste for heat transfer to a T03 package. These were used for emitter resistors and sound absolutely great. I got them surplus. New they are special order and about 40 bucks a piece.
I understand how people cannot be up on the very latest when it comes to parts, but 20 years behind; on something that has been discussed many times on the forum and which can be researched by reading a few magazines, manufactures literature, and audio parts catalogues....... well I just don't get it.
Attachments
Nominal TCR6: + 0.6ppm/°C (0°C to + 25°C)
Maximum TCR Spread from Nominal8:
± 2.5ppm/°C (0°C to + 25°C and + 25°C to + 60°C)
Good in external-preamplifiers maybe... ?
Definatley not in power amp circumstances.
I was hoping to get off with a slap cross the knuckles, but I like
this much better, an informed discipline in information 😛
Oh well, can't blame a donkey 4 trying 😀
Maximum TCR Spread from Nominal8:
± 2.5ppm/°C (0°C to + 25°C and + 25°C to + 60°C)
Good in external-preamplifiers maybe... ?
Definatley not in power amp circumstances.
I was hoping to get off with a slap cross the knuckles, but I like
this much better, an informed discipline in information 😛
Oh well, can't blame a donkey 4 trying 😀
Innocent bystander
I was aiming somewhere else. He must have ducked............. I did have an interesting experience in 1986-87? When I got samples from the local Vishay rep. I was working at a very small telecom company and the rep informed me that his clients were Rockwall, NASA, Defense Contracters, University Labs...... and WHAT WAS I GOING TO USE THEM FOR? I told him I was going to put them in my stereo. He left in a huff.
When I called Texas Components and ordered specific values, the gentleman on the phone got real excited and told me he had done his hot rodded Dynaco tube stuff with them and was blown away. We laughed about the pompose rep and Vishay now runs ads in high end audio magazines. Who knew..........
I was aiming somewhere else. He must have ducked............. I did have an interesting experience in 1986-87? When I got samples from the local Vishay rep. I was working at a very small telecom company and the rep informed me that his clients were Rockwall, NASA, Defense Contracters, University Labs...... and WHAT WAS I GOING TO USE THEM FOR? I told him I was going to put them in my stereo. He left in a huff.
When I called Texas Components and ordered specific values, the gentleman on the phone got real excited and told me he had done his hot rodded Dynaco tube stuff with them and was blown away. We laughed about the pompose rep and Vishay now runs ads in high end audio magazines. Who knew..........
Hi,
I did...He, he...Had a similar experience while trying to get hold of the now humble S102 Vishay series for my RIAA correction, some loading Rs for the MC carts etc...
When I told the importer of Vishay what I needed these for I got a 15 secs silence on the other end of the phone.
Hell, yes...at 30$ a piece it was crazy but I never regretted it...
Similar story for the Eurofarad PTFE caps etc, etc....boy, oh boy we spent a small fortune on specialty components in those days.
At least, we can say we've tried them out alright.
That was in the late Eighties, so I wasn't too far behind, Fred. 😎
If all of you can buy stuff like pure silver wire and boutique caps online nowadays, just blame us for that, thank you.😀
Cheers,😉
I did...He, he...Had a similar experience while trying to get hold of the now humble S102 Vishay series for my RIAA correction, some loading Rs for the MC carts etc...
When I told the importer of Vishay what I needed these for I got a 15 secs silence on the other end of the phone.
Hell, yes...at 30$ a piece it was crazy but I never regretted it...
Similar story for the Eurofarad PTFE caps etc, etc....boy, oh boy we spent a small fortune on specialty components in those days.
At least, we can say we've tried them out alright.
That was in the late Eighties, so I wasn't too far behind, Fred. 😎
If all of you can buy stuff like pure silver wire and boutique caps online nowadays, just blame us for that, thank you.😀
Cheers,😉
I might be two decades late but I would say you're trying to mock someone eere...
ROFL, nah I'd blame the chinese 😛
NOT Once have I bought a single strand of silver wire 😛
Bought things which are proven to work tho 🙂
Like a microwave oven that's already 15-20 years old with daily use!! and still going strong whereas you see 'new and improved' ovens by the truckload in the dump which are only 12 months old!!.
Maybe they're using series electrolyctics!? hehahahaaa
You folks reckon we might see a few of these RIO in a decade at reasonable prices? Or is there just no chance/real reason to use em.
Where it all began
I blame engineers building their own stereos and defense contractors for selling stuff to surplus stores. I want to thank the U S tax payers and the Military Industrial Complex for making it possible for me to buy a $40 part for less than a dollar. Keep your eyes open......... I hear Space Shuttle tiles make great equipment feet and aren't that hard to machine.
It's just trickle down technology and it is prevalent in just about any commercial product involving engineering.
I blame engineers building their own stereos and defense contractors for selling stuff to surplus stores. I want to thank the U S tax payers and the Military Industrial Complex for making it possible for me to buy a $40 part for less than a dollar. Keep your eyes open......... I hear Space Shuttle tiles make great equipment feet and aren't that hard to machine.
It's just trickle down technology and it is prevalent in just about any commercial product involving engineering.
Re: Where it all began
Absolutely. Three cheers for the Cold War tax payers. Otherwise, I could never have built my first stuff using Admiralty pattern oil-filled C-core chokes and transformers.
Fred Dieckmann said:
Absolutely. Three cheers for the Cold War tax payers. Otherwise, I could never have built my first stuff using Admiralty pattern oil-filled C-core chokes and transformers.
Glass Insulators
Hey, isn't about time you guys started using glass power line insulators for wiring your tube designs:
http://www.insulators.com/photos/photos/125-wu-020-christmas.htm
http://www.insulators.com/photos/photos/204-locke-010-light-aqua.htm
for really good sound, use this one!
http://www.insulators.com/photos/photos/1418-aqu.htm
🙄
Hey, isn't about time you guys started using glass power line insulators for wiring your tube designs:
http://www.insulators.com/photos/photos/125-wu-020-christmas.htm
http://www.insulators.com/photos/photos/204-locke-010-light-aqua.htm
for really good sound, use this one!
http://www.insulators.com/photos/photos/1418-aqu.htm
🙄
If it melts, get a bigger tube
Well, no wonder it melted, get a bigger tube!
4CW100,000E
The 4CW100,000E is ideal for use as a Class C RF amplifier or oscillator, a Class AB RF linear amplifier, or a Class AB push-pull AF amplifier or modulator as well as a plate and screen-modulated Class C RF amplifier. In a pulse modulator service, it can deliver a peak output of 4 megawatts. The tube is characterized by low input and feedback capacitances and low internal lead inductances.
http://www.cpii.com/eimac/index.html
Don
Well, no wonder it melted, get a bigger tube!
4CW100,000E
The 4CW100,000E is ideal for use as a Class C RF amplifier or oscillator, a Class AB RF linear amplifier, or a Class AB push-pull AF amplifier or modulator as well as a plate and screen-modulated Class C RF amplifier. In a pulse modulator service, it can deliver a peak output of 4 megawatts. The tube is characterized by low input and feedback capacitances and low internal lead inductances.
http://www.cpii.com/eimac/index.html
Don
I have some experience with hermetic resistors from various companies (including Vishay). I tried the standard oil-filled products, but subsequently asked for a custom alternative filling that proved to be more to my liking. The Connoisseur 3 preamp design used a good number of these hermetically sealed resistors.
These babies can get pretty heavy, with the can, filling and all, and the resistor leads may not have sufficient rigidity. If you ship an amplifier using these resistors, make sure that the resistor body is supported securely - otherwise tape around the resistor so that it can't short out anything if it moves.
Also, the price for higher resistance values can well exceed the 40 dollars mentioned here.
Apart from those two caveats, the resistors were fine and worked well.
hth, jonathan carr
These babies can get pretty heavy, with the can, filling and all, and the resistor leads may not have sufficient rigidity. If you ship an amplifier using these resistors, make sure that the resistor body is supported securely - otherwise tape around the resistor so that it can't short out anything if it moves.
Also, the price for higher resistance values can well exceed the 40 dollars mentioned here.
Apart from those two caveats, the resistors were fine and worked well.
hth, jonathan carr
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