Equivalent for NTE 452

[sergio]

Hi , there are a good equivalent for NTE 452 JFET?

For me is difficult search the original in Europe...

Thanks all.

Sergio Italy..

[glasman]

Hi , there are a good equivalent for NTE 452 JFET?

For me is difficult search the original in Europe...

Thanks all.

Sergio Italy..

The NTE 452 was designed as a replacement for Thompson's SK9072.

Probably any N-channel FET designed for VHF/UHF amps would work with small changes to the bias resistor. There are probably some out there that have a better noise figure as well. I find the 452 a bit "hissy".

[Funkalicousgroove]

2n4416A, Just as noisy as a 452, but about 1/10th the price-

[BobW]

I agree, any N channel JFET will work in the audio range, just a bias change may be necessary.

After forgetting to include the NTE part in the initial parts order, I bought an MPF102 available from Radio Shack. It worked OK w/o issues, but the cost was almost $2. Still cheaper than the cost of another shipping order.

[UltraHookedOnPhonix]

Since the 2N4416 is designed for amplification at high frequencies, could there be a connection to the noise and the fact that it is wideband?

I find these things very noisy but they have the same noise figure as a J201 which is a pretty quiet. There seems to be a constant sshhhhhh-sound even at low levels. Maybe do away with the high-end pre-emphasis filter at the 452's Gate or just the 100pF cap.

[Funkalicousgroove]

or just don't play throgh the awful sounding thing!!!!

[glasman]

Naw, the idea is a good one but the d-pre is not a great bit of engineering. I really like what adding 10 to 15dB of gain on the front end does for single pickups. The second sucky side of it is a phase inversion, but that is fixable as well.

[ic-racer]

Hi , there are a good equivalent for NTE 452 JFET?

For me is difficult search the original in Europe...

Thanks all.

Sergio Italy..

NTE 458 is about 1/3 less expensive. Does not have the case ground (ie 3 pin).

[glasman]

Hi , there are a good equivalent for NTE 452 JFET?

For me is difficult search the original in Europe...

Thanks all.

Sergio Italy..

NTE 458 is about 1/3 less expensive. Does not have the case ground (ie 3 pin).

I think his biggest problem is that it is NTE. NTE is just a generic replacement parts company, like ECG of old, poly paks etc etc etc. They don't make anything themselves, it is all outsourced.

What he needs are good Jedec numbers.

[glasman]

Actually I thought the 2N5486 might make a good replacement.

[heisthl]

Why not just use a TLO61 or low noise TL071 IC for the FET?
Here's a link to the datasheets:
http://focus.ti.com/lit/ds/symlink/tl061.pdf


http://focus.ti.com/lit/ds/symlink/tl071.pdf

[UltraHookedOnPhonix]

or just don't play throgh the awful sounding thing!!!!

Ha Ha!!! Yeah, just slap some tape over the jack and be done with it!

Why not just use a TLO61 or low noise TL071 IC for the FET?

Interesting point. You could easily set up a non-inverting gain stage and take care of the problem Gary was mentioning. Maybe even put some diode clipping in there! Uh oh...now I've done it

[heisthl]

The price on a TL071 is about .50 and I found a PCB for a MXR micro amp for $10. Total cost of a substitute FET board will be <$20 and I can have a mini pot on the front of the amp. I think I'm going to try one (on a footswitchable relay ala 2 Rock) and see how it does - I used to have one on my pedal board and loved it.

[UltraHookedOnPhonix]

The price on a TL071 is about .50 and I found a PCB for a MXR micro amp for $10. Total cost of a substitute FET board will be <$20 and I can have a mini pot on the front of the amp. I think I'm going to try one (on a footswitchable relay ala 2 Rock) and see how it does - I used to have one on my pedal board and loved it.

The Microamp would be a great front end. It’s simple and sounds great! The “Level” control is actually a gain control and what sets the volume is a fixed voltage divider on the output. Maybe use trimmer pots for both gain and volume? Also, you could use asymmetrical clipping in the opamp’s feedback loop and less input impedance and you’ve essentially created a Zendrive. One of my favorite single op-amps is the TI TLC271 ($.76). It’s designed for single supply (not bipolar operation) and max supply voltage is 18V. Datasheet here: http://focus.ti.com/lit/ds/symlink/tlc271.pdf
Or, if you’re feelin’ real fanzy-shmanzy, you could try Linear Tech’s LT1115. Datasheet here: www.linear.com/pc/downloadDocument.do?n ... 1293,D1612

[martin manning]

Naw, the idea is a good one but the d-pre is not a great bit of engineering. I really like what adding 10 to 15dB of gain on the front end does for single pickups. The second sucky side of it is a phase inversion, but that is fixable as well.

What is the disadvantage of the phase inversion? Seems like it wouldn't matter unless there is some parallel device in use, or the amp were configured to use both inputs.

MPM