NE571 change

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devastator
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Post by devastator »

Hi,

I've to change the NE571 of my Guyatone tube echo ADX (analog version) , I saw banzai sells their really high (6euros) compared to what we can find on ebay (+/- 2euros). why ?

I'd like to have your opinion about that, the ones sell on ebay are brand new or took from electronics parts ? (no doubts that banzai sells brand new )

(I read a post of Dirk hendrik about how you can destroy that chips with static electricity (like BS170 are) and i'd like to avoid buying a dead chip)

happy new year !!
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Post by mictester »

devastator wrote:Hi,

I've to change the NE571 of my Guyatone tube echo ADX (analog version) , I saw banzai sells their really high (6euros) compared to what we can find on ebay (+/- 2euros). why ?

I'd like to have your opinion about that, the ones sell on ebay are brand new or took from electronics parts ? (no doubts that banzai sells brand new )

(I read a post of Dirk Hendrik about how you can destroy that chips with static electricity (like BS170 are) and i'd like to avoid buying a dead chip)

happy new year !!
The NE570 and 571 haven't been made for about 10 years. Philips sold the manufacturing rights to On Semiconductors http://www.onsemi.com who make SA570 and 571. These are identical to the originals, so you can buy the $2 ones on ebay without worrying. I usually pay $1.25 each for 20 of them.

Why do you need to change the 571 in your Guyatone? I've NEVER seen one fail. The fault is probably somewhere else!
"Why is it humming?" "Because it doesn't know the words!"
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devastator
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Post by devastator »

Why do you need to change the 571 in your Guyatone? I've NEVER seen one fail. The fault is probably somewhere else!
I had some loud noise oscillation and distortion , a thing really strange.

I followed the advices of a guy on an other forum , I took off the NE571 from the circuit and connected different points to make the sound coming into the delay part ) and I had a perfect clean delayed signal at the output (expect a litle oscillation noise when the time is at max). So I assume its the guilty (I'll check the voltage to be sure there's any voltage issues around (bias at AOP are corrects by the way) )

So, banzai sells the old version, the "vintage" one , explaining the price.

thanks for your response mictester
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