John Curl's Blowtorch preamplifier part II

[simon7000]

They often sell pulls, not new, not fakes to their knowledge.

 

[hitsware]

" Pulls " of TO92 ?
Doesn't seem it would be worth it ?
I would suppose one could ask them .
I've had good luck ( but not all that much experience )
with Asian vendors .

 

[simon7000]

Really easy to pull. If you get some look at the lead length. I have bought from them on hard to get parts and they have been fine. It was noticable the leads had been retinned.

 

[hitsware]

One could almost say
' burned in ' .....

 

[indra1]

2SJ74 Toshiba,TO-92 | IC Chips | UTSOURCE

I am quite that this one is fake. Original Toshiba marking is not like that.

 

[simon7000]

Cheap and not a pull. Looks like you are right. But ask them about return policy. At that price not worth it. But might be worth it to buy 10 and test them. Might just be close enough for a substitute.

 

[hitsware]

Marking looks similar to this :

2SJ103 2SJ103GR Genuine Toshiba Audio JFET @ AmpsLab

 

[indra1]

Marking looks similar to this :
2SJ103 2SJ103GR Genuine Toshiba Audio JFET @ AmpsLab

Sorry, but not similar enough.
Toshiba TO92 jfets were customarily marked by paint based pad printing with 3 different sized font, largest for type, smaller for grade and smallest for manufacturing code which can clearly be seen on the Ampslab's J103. The J74 marking shown previously looks like marked with laser with all 3 marking the same font size, a fake in my opinion.

 

[hitsware]

I sorta maybe see what you mean .........

 

[Tournesol]

Strange period of decadence where fake transistors are on the market like fake Egyptian antiquities.
Who could have imagined this in the 80s?

 

[simon7000]

You mean I should unwrap those cat mummys I bought to see if they are real?

Even worse, do you know why butcher's paper is brown?

 

[Tournesol]

1-You mean I should unwrap those cat mummys I bought to see if they are real?
2-Even worse, do you know why butcher's paper is brown?

1 Make-it at your own risk (The curse of the Pharaoh, see attached)
2 I'm afraid of what will follow ;-)

 

[scott wurcer]

The J74 marking shown previously looks like marked with laser with all 3 marking the same font size, a fake in my opinion.

No the laser branding appears on real parts (it can't be removed easily). I have fake parts where laser branding was faked by hand with Chinese chop carving tools. Many here might not realize that there are many folks well trained in miniature carving in China. The minute inconsistencies in the characters are obvious under a microscope.

I wish folks would stop crying fake on small signal FET's without measuring the basic three terminal characteristics.

 

[simon7000]

Paper used to be made from rags. The cheapest rags came from Egypt. Yes old mummy wrappings. These had been soaked in creosote (tar-ish) to preserve them. When these rags were used the resulting paper was brown and not suitable for writing or printing. So it got used for wrapping paper. This started around the 1850's. Later at the end if the century cholera broke out in several pandemics. Some blamed this on the mummy paper so it stopped being used and brown wood pulp paper replaced it.

This story has as much creditibilty as many of the internet posts and the audio theories bandied about on these threads. But certainly has it's adherents.

 

[scott wurcer]

Funny Ed, true paper was invented by the Chinese.

 

[simon7000]

Which version? Papyrus, vellum, rag, wood or one of the other variants? I think you are refering to the screen method of paper making that replaced the ground rock.

 

[scott wurcer]

Which version? Papyrus, vellum, rag, wood or one of the other variants? I think you are refering to the screen method of paper making that replaced the ground rock.

Papyrus is not considered true paper. The first Chinese paper used even worn out fishing nets as well as any recycled fabric. and bark. You do know rice paper has nothing to do with rice?

 

[simon7000]

No wonder why it tastes bad!

 

[morinix]

Thank you, Thank you, Thank you for bantering about Tommy Emmanuel a few days back. I clicked the link and was floored! I knew nothing of this phenom.

Anyway, lady luck smiled on me and I will be seeing him in concert this Thursday.

 

[Zaphod Beeblebrox]

Rice paper - Wikipedia