I need a transistor

[W1GUH]

Either a 2SC2498, a 2SC2570A, or the current equivalent.

[KJ6BSO]

Oops--dynamically generated content, the link didn't work. Try this instead:

http://www.nteinc.com/specs/10to99/pdf/nte10.pdf

[kd8dey]

2sc2498=NTE23=sk9139/sk9671
2SC2570A=NTE10=sk9139

[W1GUH]

Thanks for the info. Will probably just get one from Ramsey -- it's for one of their kits. I was hoping someone here could mail me one by USPS. I can't use UPS or FEDEX, and I'll bet it'll be hard to find a company the doesn't use either of those.

And, there's always the hamfest season coming up. What the hell...I've waited 10 years already to finish it!

[KJ6BSO]

I'd send you one if I had one. But Mouser has them and they'll ship USPS.

http://www.mouser.com/ProductDetail/NTE/NTE10/?qs=sGAEpiMZZMutXGli8Ay4kOnWbBYZueaHj4DOkn1FHA4%3D

[W1GUH]

I'd send you one if I had one. But Mouser has them and they'll ship USPS.

http://www.mouser.com/ProductDetail/NTE/NTE10/?qs=sGAEpiMZZMutXGli8Ay4kOnWbBYZueaHj4DOkn1FHA4%3D


Outstanding!!!!
Thanks!

[n2ize]

Thanks for the info. Will probably just get one from Ramsey -- it's for one of their kits. I was hoping someone here could mail me one by USPS. I can't use UPS or FEDEX, and I'll bet it'll be hard to find a company the doesn't use either of those.

And, there's always the hamfest season coming up. What the hell...I've waited 10 years already to finish it!

How come you can't use UPS or FEDEX ? I've used them almost everywhere imaginable and never had no trouble.

[kd8dey]

I'm several miles from Midwest Surplus (have a limited stock of NTE parts) and gobs of transistors, ic's zeneir/diodes etc and only a few miles from mendelsons. If I cant find what I want there.......

[W1GUH]

How come you can't use UPS or FEDEX ? I've used them almost everywhere imaginable and never had no trouble.

I have no doorman, so they can't leave it. When I call either UPS or FEDEX, the never, repeat NEVER do what they say they're going to do, e.g., leave it at the depot where I can pick it up. I've made many trips to either the So. Bronx for UPS, or over by the Hudson in the 30's to pick something up, only to hear, "The driver forgot to leave it." Neither carrier gives a shit about this.

The Post Office is a block away and always does what they say they'll do.

Answer your question?

[kd8dey]

http://www.youtube.com/watch?v=xcIOy6XcM3s

http://www.youtube.com/watch?v=sgAq_KnDIPc&feature=related

[KC2UGV]

I have no doorman, so they can't leave it. When I call either UPS or FEDEX, the never, repeat NEVER do what they say they're going to do, e.g., leave it at the depot where I can pick it up. I've made many trips to either the So. Bronx for UPS, or over by the Hudson in the 30's to pick something up, only to hear, "The driver forgot to leave it." Neither carrier gives a shit about this.

The Post Office is a block away and always does what they say they'll do.

Answer your question?

I think the confusion arose there because Fedex (Not sure about UPS) will deliver ANYWHERE. Even out to a military field location during a FTX. In the middle of the Mojave Desert with just a grid set.

[kd8dey]

Either a 2SC2498, a 2SC2570A, or the current equivalent.

Went by Midwest surplus on the way to the shoe store.
keep an eye on your mailbox
73

[W1GUH]

Went by Midwest surplus on the way to the shoe store.
keep an eye on your mailbox
73

You sweetheart! How much do I owe you?

[kd8dey]

You sweetheart! How much do I owe you?

Just passing a favor to another islander. Was the proud recipient of some Bat 25's recently.......Thanks again cor.
What comes around goes around..........
sent 1 of both NTE's. The box in front of the post office has pick ups hourly. since NY isn't that far you will probably get them in time for the weekend.

[W1GUH]

Sure appreciate that. Looking forward for a chance to pass the favor along.

Cheers!:cheers:

[W5GA]

I think the confusion arose there because Fedex (Not sure about UPS) will deliver ANYWHERE. Even out to a military field location during a FTX. In the middle of the Mojave Desert with just a grid set.
Pizza?

[W1GUH]

'dey:

Parts came yesterday. Thanks again!

[kd8dey]

'dey:

Parts came yesterday. Thanks again!

Kewel :)

[PA5COR]

BAT 85 Schottky ( Phillips) they were ;)


Just passing a favor to another islander. Was the proud recipient of some Bat 25's recently.......Thanks again cor.
What comes around goes around..........
sent 1 of both NTE's. The box in front of the post office has pick ups hourly. since NY isn't that far you will probably get them in time for the weekend.

[kd8dey]

BAT 85 Schottky ( Phillips) they were ;)

yep thats what I meant bat 85's

[KA5PIU]

Hello.

Good to see you got what you were looking for.
This is an NPN RF transistor that is very common.
The NEC NE021 series fits the bill.
I no longer have any parts stocks in the Texas area, everything is now assembled somewhere else at this time.
If it is something really odd I can get most likely get you a cross.
But, in Texas, the most fantastic source of hobbyist parts is Tanners Electronics.
http://www.tannerelectronics.com/
Since everything I do now is on the verge of weapons I pretty much am controlled.
Anyone up for 41kHz audio at 140+ dB?
How about 600mW of laser energy?
Nearly a million watts of light flash?
The Tesla coil/transmitter that operates at 135kHz that resides in a briefcase is always fun, a 20+kW pulse tends to be a problem for some electronics.
This is a bunch of these things. ;)
http://www.maxwell.com/products/ultracapacitors/product.aspx?PID=16V-SMALL-MODULES
This is a one shot pulse.

[W1GUH]

Can I get one of each?

[KJ6BSO]

Speaking of transistors, if anyone out there ever needs a high voltage switching transistor to repair the horizontal sweep on a CRT TV/monitor, let me know. I've got a lot of them.

[W1GUH]

Do sweep transistors work as good as sweep tubes in a PA? Just had to ask...imagine...

Super new mega-transciever...uses sweep transistors to save you money!

OK....sarcasm done!

[KC2UGV]

Pizza?

Yup :) Not Fedex, but the pizza guys near Ft. Hood were mostly GI's, so they knew how to get to a grid set :)

[NA4BH]

I'm not an electronics guy like the rest of you, but I have some NTE 2525 should you need some. I used it to fix the ICOM 746 PRO display problem.

[W5RB]

I'm not sure if I shared this here before , but http://octopart.com/ is a handy tool for finding electronic parts anywhere .

[KA5PIU]

Do sweep transistors work as good as sweep tubes in a PA? Just had to ask...imagine...

Super new mega-transciever...uses sweep transistors to save you money!

OK....sarcasm done!

Hello.

Been there, done that. ;)
https://forums.qrz.com/showthread.php?157980-New-sweep-quot-tube-quot-2SC5588.
The sweep module for the Mitsubishi 36 inch CRT TV is rated at 1600 watts dissipation peak.
The 6JS6C TV sweep tube that was at one time common and is used in the FT-101 was one common point of failure in this radio.
The other weak areas are the power transformer and pi matching circuit.
If you replace all of this than the repair of the FT-101 becomes easy.
And you will have a radio that can do legal limit by itself if provided with enough cooling and 50VDC.
With "only" 12VDC we get a meager 200+ watts out.
All ratings SSB.
If you can find them, the sweep module for the Mitsubishi 40 inch is the way to go, CS-40805.
This module has double the ratings!
As the size of the set gets larger the ratings grow exponentially.
Yes, the sweep module was never rated for HF service, but this is also true of the sweep tube.
But, a module that can dissipate nearly 4000 watts peak?!
Even if you ran it at half ratings you would exceed legal limit.
At legal limit it would be so well within its ratings that feeding a short or open would not be a problem, indefinitely.
I have mine set for 210 watts and was very careful when I was transmitting. ;)
This is the load.
http://genet.gelighting.com/LightProducts/Dispatcher?REQUEST=COMMERCIALSPECPAGE&PRODUCTCODE=25936&BreadCrumbValues=^Long%20Life&SearchFieldCode=null

[W1GUH]

I'm not sure if I shared this here before , but http://octopart.com/ is a handy tool for finding electronic parts anywhere .

For the octomom?

[KJ6BSO]

Having so many of them, I checked into what else they could be used for and the answer was: not much. Horizontal deflection transistors are used strictly as switches, they have very little gain and are designed for operation at 16KHz or less. Other than their intended use, about the only other thing you can do with them is build switching power supplies.

[KA5PIU]

Hello.

Try the 2SC5588.
True, they have little Voltage gain but they are intended for Current gain.
And, I have been able to switch 30MHz+, and there is the key.
Radios that use the TV sweep tubes use a matching circuit to smooth the waveform.
The pi network is critical to both coupling and harmonic suppression, be it TV sweep tubes or TV sweep transistors.
That is the only way to get one to go past a few kHz.

[KA5PIU]

Hello.

http://www.datasheetcatalog.org/datasheet/toshiba/3510.pdf

Hello.

It will switch a 300mA at 850Volt load at 40MHz to pulse service, 240watts.
They have very little gain at that frequency.
I have built a few Tesla coils that use this, 160 to 190kHz is the normal operating frequency range so there is some gain.
But, at the higher frequencies you must employ voltage gain.
They are good to over 4mHz with no special precautions.
My other use for them is below or above the AM broadcast band are frequencies that are common to communist countries.
150 to 550kHz and 1600 to 3200kHz.
I have not only confirmed this today but built another transmitter and tuned it to 40.5mHz and DFed it.

[KJ6BSO]

Post a schematic, Rudy. I'd like to try my hand and building one, seeing as I have a metric assload of horizontal deflection transistors.

[KA5PIU]

Post a schematic, Rudy. I'd like to try my hand and building one, seeing as I have a metric assload of horizontal deflection transistors.


Hello.

This started as a replacement for the output tubes for the FT-101.
My test fixture was an isolation transformer set up to do DC and driving the transistor Emitter to collector at around 160 volts, very unscientific but I had no easy way to produce DC at the voltages needed at the time.
The signal was superimposed to the base and collector, current gain being the goal.
If I could keep the light lit at the highest frequency was the goal.
I went from about a kHz, confirmed, to 40MHz, the highest fundamental frequency the function generator would do.
I looked at the output on a 'scope, distorted waveform, but to be expected, no bias.
The drive Voltage must be fairly high, they are high voltage transistors.
The pi matching circuit for the FT-101 is configured for a tube output, bring the primary impedance of the pi network down to around 1/4th its value but leave everything else alone.
You will not be feeding it HV, but the impedance is very important.
Since the FT-101 was a very common CB unit, the finals and power transformers are hard and very hard to find, in that order.
So, finding junk FT-101 radios are not that hard, it is just a question of how cheap.
Anyhow, rip out the transformer and replace the entire and tubes, tube sockets, etc.
A pair of PC power supply units is an excellent start.
The entire will soon run on one of 2 primary voltages.
100 volts presented as two 50 volt segments.
And 12 volts presented as two 6 volt segments.
No tubes.
100 to 125 goes in, gets turned to DC, etc.
We want 6 volts in place of 5, etc.
All of the stuff you need to do to a computer switching power supply.
100VDC in place of the HV and a chunk of silicon, the final design will have 2.
Tune, and it works.
The intended range was to only be 160 but they indeed do work to above 10 meters.
The output section must be configured mush like the tubes were, who themselves were never intended for 10 meter operation.

[KA5PIU]

Post a schematic, Rudy. I'd like to try my hand and building one, seeing as I have a metric assload of horizontal deflection transistors.

Hello.

Only Some sweep transistors work well.
The Hitachi 2SC5588 works fairly well.
This is due to the way Hitachi does the flyback circuit.
They use the sweep circuit just like the old tube circuit, the transistor runs both the flyback and the sync driver, so the transistor has to be able to do the entire video image.
The sync separator is again a pair of diodes, a bit better video quality at the expense of doing this all at around 300+ volts.