Lower gain 12AX7?

[ruffrecords]

Well, if I misinterpreted your terms "weird," "strange," and "unusual," to mean "weird, strange, and unusual," you have my apologies. Perhaps there's a difference in American usage of these terms.

I think there is very little difference but again you miss the point. I was not saying the availability of those values was weird etc (and you were at pains to point out repeatably that those values are available) but I was saying that the choice of values was weird etc.

I am sure that even in America there is a difference between choice and availability.

Cheers

Ian

 

[ruffrecords]

Reference here: Standard Resistor Values :: Radio-Electronics.Com

That is an interesting reference and I can understand how it might mislead you into thinking that E24 series means 5% tolerance component.

The fact of the matter is that pretty much all metal film resistors are made to 1% tolerance these days, no matter what series you choose to buy from. You can plainly see E24 values available in Farnell at 1% tolerance.

For example, and as you rightly point out, some E24 values do not exist in the E96 series. In the E24 series there is a 200 ohm value but not in the E96 where there is a 221. However, despite your belief that E24 means 5% tolerance and carbon film to boot, 200 ohm resistors are readily available in 1% tolerance metal film types and you can even buy E12 series kits of 1% metal film resistors.

MULTICOMP|MF0W2FFE012KIL|RESISTOR, KIT, 0.5W 1% E12 | Farnell United Kingdom

The bottom line is, as I said to the other poster, that 99.99% of designs can be done with the E24 series values, and despite their availability, I see no good engineering reason to select E96 values.

Cheers

Ian

 

[DF96]

Sorry to stay OT, but in the UK we have a reliable supplier (Rapid Electronics) who stocks Vishay E96 1% resistors, but only the E6 values from the range. Like many people from my generation, I tend to think in terms of E12 for most values, with E24 for precision things like RIAA. I emailed them to ask if they could expand their range, either adding the nearest E96 to each E12 value, or stocking the E24 5% range too. They replied, asking me to list the values which I would like them to stock. At that point I gave up.

As a result of my E12 brain, many modern circuits appear to have strange resistor values which may be difficult to obtain in the UK from the usual hobbyist suppliers. I even thought for a while that the designers were being clever, and implying a greater degree of design precision than is warranted for most circuitry - too many sig figs is a common newbie problem. End of OT comment!

 

[ruffrecords]

As a result of my E12 brain, many modern circuits appear to have strange resistor values which may be difficult to obtain in the UK from the usual hobbyist suppliers. I even thought for a while that the designers were being clever, and implying a greater degree of design precision than is warranted for most circuitry - too many sig figs is a common newbie problem. End of OT comment!

Ah, I think you hit the nail on the head. It's an old UK head set versus a new USA head set thing. I am 60 years old and like you I rarely find a need to go outside the E12 series let alone the E24. These youngsters in the States seem to have been brought up on E96 and use it without a thought whereas to us old E12 brains all the values appear wierd, odd whatever.

Thanks for clearing that up.

Cheers

ian