Preamp Tubes Lots Of them.

snow

A few more tubes

63.Sylvania-JAN-6DJ8-12-$7.50 each
64.Amperex Bugle Boy-6DJ8-4-$20.00 each

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65.Telefunken-12AT7-2-$25.00 each
66.RCA-12AT7 grey plateds D getter-1-$10.00
67.Sylvania-12AT7-Grey plates halo getter-1-$5.00
68.RCA- 12AT7 clear top halo getter Black plate-$15.00
69.Raytheon branded Siemens made in Germany-12AT7 grey plates halo getter-1-$15.00

dkfreebird

I will take both #65 please

muncybob

Man, you're killing me here! PM sent on #64

hochpt21

@snow

Do you have 2 of the #64 still available? Or did @muncybob take all 4?

Thanks,
Paul

snow

Hi Paul Bob took them all Sorry.


Rgards Snow

MrBuhl

Hi Snow - I'd like to add the following to my order:

15. 12AX7 Telefunken - The remaining (3) I think that are left?

That better finish me up if you want to PM me my total.

hochpt21

snow wrote: »

Hi Paul Bob took them all Sorry.


Rgards Snow

Ok, thank you.

heiney9

Is #16 sold? Also what are the date codes? I don't recall seeing any Amperex tubes with long plates and halo getter, unless they are Hamburg tubes with the 45* halo.

Or maybe they are Mullards. Single post or double post halo?

snow

Hi Brock yes # 16 is sold Ecod123 got them mybe you can ask him what the codes are when he gets them? I do have one Amperex 12AX7 left it is a short grey plate halo getter I think it was a BB type but the print is gone so hard to tell the code on it is Δ013


Regards Snow

heiney9

Thanks Snow, but I was just curious about the long plates. He got a great deal if they are long plates. With the halo they are most certainly Blackburn or Mitcham made tubes. ECC83 Mullard made lp's go for a premium these days.

H9

snow

heiney9 wrote: »

Is #16 sold? Also what are the date codes? I don't recall seeing any Amperex tubes with long plates and halo getter, unless they are Hamburg tubes with the 45* halo.

Or maybe they are Mullards. Single post or double post halo?

I think your right the only long grey plate halo getter ones were made in Hamburg and in Surrenes France if I remember right,

Of course sometines it is easy to think they are Amperex tubes and were made by Mullard or visa versa I sold a BB tube that said made in England the other day

Regards Snow

heiney9

Amperex and more specifically Bugle Boy was the label used to market Philips made tubes in the USA.

Any Amperex labeled tube could be from any of the Philips arms of manufacture. Most common is Holland, but England Mullards were common also as well as anything from Italy or France and occasionally a Hamburg tube. The Hamburg tubes having a 45* halo, no post on the ECC83.

I don't know of any Holland long plates with a halo, Mullard Blackburn and Mitcham long plate manufactured tubes had either a double post square getter (early and rarer) or a single or dbl post halo getter.

My guess is he got Mullards..............but perhaps he'll chime in.

No biggie, I was interested in the LP's if they hadn't sold because your pair was cheaper than most single's I see for sale.

H9

snow

heiney9 wrote: »

Amperex and more specifically Bugle Boy was the label used to market Philips made tubes in the USA.

Any Amperex labeled tube could be from any of the Philips arms of manufacture. Most common is Holland, but England Mullards were common also as well as anything from Italy or France and occasionally a Hamburg tube. The Hamburg tubes having a 45* halo, no post on the ECC83.

I don't know of any Holland long plates with a halo, Mullard Blackburn and Mitcham long plate manufactured tubes had either a double post square getter (early and rarer) or a single or dbl post halo getter.

My guess is he got Mullards..............but perhaps he'll chime in.

No biggie, I was interested in the LP's if they hadn't sold because your pair was cheaper than most single's I see for sale.

H9

He could well have gotten Mullards even though I usually can tell because I look at both the date codes and to see if they have 2 seams or 4 on top but I have looked at and tested so many tubes in the last few days I am dreaming about them at night

I am a little surprised you have jumped on the Mazda silver plate tube yet or the Japanese made TEN tube or the Hitachi 3 mica 12AX7's there all as rare as can be



Regards Snow

heiney9

I have a pair of the Mazda's already. Mine are the even rarer one's. I haven't really given them a good listen beyond a test listen after I got them.

Since you only have singles I guess I wasn't considering them. Give me first dibs while I do some research on those as see if any other singles are available. For me my secondary rig uses 12AX7's so I tend to hold back a little more in buying 12AX7's.

Now I'm curious what he got..........always looking to add to my tube knowledge.

Thanks

H9

heiney9

Do you have a pic of the Mazda? Ladder plates or "pinch plate"? I don't know that I've seen a silver long plate (ladder), unless it's a Siemens or EI made some "silver bullets" in the 80's.

Mine looks like this. Short "pinch plate" with a single hole in the center of plate, 2 square cut outs in the wings (this is the rarer version). The more common one has a slot instead of a hole. They come in gray plate as well.

snow

heiney9 wrote: »

I have a pair of the Mazda's already. Mine are the even rarer one's. I haven't really given them a good listen beyond a test listen after I got them.

Since you only have singles I guess I wasn't considering them. Give me first dibs while I do some research on those as see if any other singles are available. For me my secondary rig uses 12AX7's so I tend to hold back a little more in buying 12AX7's.

Now I'm curious what he got..........always looking to add to my tube knowledge.

Thanks

H9

Here are a couple of pics of the Mazda Hitachi and TEN branded tubes I think the TEN tube was made by NEC but not sure all I know is that I rarely ever see them in person or on Ebay. I also have one other tube it has long shiny black plates and what appears to be a third mica of some sort? not sure who made it perhaps you can tell me?













Regards Snow

heiney9

The Hitachi is a rare one. Although there are a some on Ebay at the moment.

I am afraid to say the Mazda one appears to be one of the EI (Yugoslavia) smooth plate silver "bullets" from the 80's. They were made on discarded Telefunken machining before the NATO bombing over there. Not as rare or desirable as the Mazda's. Have you actually listened to it? Half the time the EI 12AX7's (gray or silver) were prone to microphonics.

Mazda never made a ladder type "silver" plate tube that I am aware of. The smooth plate gives it away as an EI tube. EI tubes sometimes have a dot with a semi-circle above, usually in a goldish color, that's their code. But they are faint and haphazardly stamped in most cases.

The 10 one it's hard to say, I have never seen an NEC tube with pinch style plates before and the mica teeth are sort of funky looking in the photo. I will do some research.

The last one looks like a Sylvania, but again I can do some research.

H9

heiney9

Looking at the second photo of the silver plate tube I can see EI markings towards the bottom.

I have a pair of ECC82's exactly like the ECC83 in the photo, and they are a very respectable tube if they aren't a bit microphonic.

snow

Thanks for the info on the tubes I believe you are correct on the Mazda tube after looking at the codes it appears to be a EI made tube the TEN branded one is an odd one all'right it has a funny little very square small getter the first I have seen like that, the last tube I have no idea what it is not a code or mark on it.



Regards snow

heiney9

I am not as well versed in the Asian made tubes. I know Hitachi made a very rare black plate with a smallish square getter.

snow

Heres another odd one for you it is a clear top 12AT7 not sure who made it, it has a stop sign that looks like a Tung-Sol one but RCA Raytheon and GE were the only ones that I know of that made clear tops it has a halo getter and Black plates.





Regards Snow

heiney9

Any of the clear tops I've seen have side getters, so the flashing is on the side of the tube. If I had to guess before doing any research, I'd say the flashing material is all gone from the top. Most likely an RCA as I don't think RCA or GE made black plates w/halo.

I admit my mind is a bit rusty on 12AT7's since I no longer have the Dared.

JuanR

Snow & anyone else that knows the answer....

I have Telefunken 12ax7's and 12au7's with worn lettering....

How can I identify which tube is the AX or which tube is the AU?

Thanks

Juan

heiney9

I'm not sure you can visually. I don't know if there is a way without a tube tester. Even if the date codes were there, I have never seen a TFK tube with 2 lines of code. One being the identifier and change code (usually the top line) and then the place and date of manufacture (usually the 2nd line).

You are certain they are TFK's? There is a diamond shape impregnated in the bottom glass between the pins?

H9

snow

Like Brock says I think the only way to be sure is on a tube tester. Brock does your Mazda 12AX7 have a rod that looks like it has a threaded screw running through the hole in the plate like this tube does?




Regards Snow

JuanR

heiney9 wrote: »

I'm not sure you can visually. I don't know if there is a way without a tube tester. Even if the date codes were there, I have never seen a TFK tube with 2 lines of code. One being the identifier and change code (usually the top line) and then the place and date of manufacture (usually the 2nd line).

You are certain they are TFK's? There is a diamond shape impregnated in the bottom glass between the pins?

H9

Positive they are TFK's still have part of the logo and they all have the diamond shape...

So, I 'm about to get my hands on a B&K 747B tube tester...what readings should I be looking to get to identify....

Sorry Snow for eating up some of your thread...I can take it elsewhere or PM me guys if you know the answer....

heiney9

Yes, that's the rarer version of the Mazda (French made) short silver plate (like the pair I have). Date codes should be AXA with a 4 number code underneath usually in black print. But many times wiped off already.

Most tubes have that going through them, we just never see it. It's a wire wound grid post. The more common (yet still rare) silver version of the above tube has a rectangular slot instead of the hole and you can see even more.

There is a gray plate version as well in both configurations. The reason these are more rare is not many silver plate versions were made.

H9

snow

heiney9 wrote: »

Yes, that's the rarer version of the Mazda (French made) short silver plate (like the pair I have). Date codes should be AXA with a 4 number code underneath usually in black print. But many times wiped off already.

Most tubes have that going through them, we just never see it. It's a wire wound grid post. The more common (yet still rare) silver version of the above tube has a rectangular slot instead of the hole and you can see even more.

There is a gray plate version as well in both configurations. The reason these are more rare is not many silver plate versions were made.

H9

Ok I have one then but it's labeled silvertone of all things no codes that I can see.



Regards Snow

heiney9

Mine are labeled Silvertone also, and I got them cheap because the seller really didn't know what they were. That's when a good eye for internal construction can help grab a great deal!

To Juan:

Hopefully you'll get the manual and the 12AX and 12AU will have different parameters. I'm guessing based on how each tests relative to the 12AX and 12AU parameters you'll have an answer.

H9

snow

JuanR wrote: »

heiney9 wrote: »

I'm not sure you can visually. I don't know if there is a way without a tube tester. Even if the date codes were there, I have never seen a TFK tube with 2 lines of code. One being the identifier and change code (usually the top line) and then the place and date of manufacture (usually the 2nd line).

You are certain they are TFK's? There is a diamond shape impregnated in the bottom glass between the pins?

H9

Positive they are TFK's still have part of the logo and they all have the diamond shape...

So, I 'm about to get my hands on a B&K 747B tube tester...what readings should I be looking to get to identify....

Sorry Snow for eating up some of your thread...I can take it elsewhere or PM me guys if you know the answer....

No worries not sure what the readings are going to be on your 747B tester but if you test it as a 12AX7 and it tests very very high it will be a 12AU7 if it tests really really low then it will be a 12AU7 the bias volts make a huge difference between the two tubes.


Regards Snow