Source for old vacuum tubes - 12AX7

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Posting on behalf of someone who is trying to source some 12AX7 vacuum  
tubes for a guitar amplifier.

He has a preference for old stock as the recently manufactured valves  
are apparently noisier or have less pleasant audio response.

Hopefully someone here can help with an Australian source?

Thanks

Re: Source for old vacuum tubes - 12AX7

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Tell him(?) to try practically any music store, and stop imagining things.

geoff  



Re: Source for old vacuum tubes - 12AX7

"Scromlette"

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**  Nostalgia is a bitch.

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** Try " ECC83 " on Ebay.

 Someone in Brisbane has a pair of  NOS Telefunkens on auction.

BTW:

12AX7 is the US number, ECC83 is the European equivalent.

Also look out or 7025, ECC803, E83CC, 5751, 7058, 7729, 6681 and CV4004.


...  Phil




Re: Source for old vacuum tubes - 12AX7
On 6/09/2013 10:48 PM, Scromlette wrote:
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Thanks gents, I'll pass the info on.

Re: Source for old vacuum tubes - 12AX7
On 7/09/2013 12:48 AM, Scromlette wrote:
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**I second PA's suggestions. The 7025 (if you can find them) were  
specifically designed to be quieter than regular 12AX7 valves.  
Telefunkens will likely cost a small fortune.

--  
Trevor Wilson www.rageaudio.com.au

Re: Source for old vacuum tubes - 12AX7

"Trevor Wilson"
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***Here is the listing:

http://www.ebay.com.au/itm/radio-valves-ECC83-x-2-NOS-/190896149762?pt=AU_Electronics_Vintage_Electronics&hash=item2c724c1502#ht_16wt_951

Only $20 and two days to go.



...  Phil  



Re: Source for old vacuum tubes - 12AX7
On 9/09/2013 9:51 AM, Phil Allison wrote:
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**Looks cheap to me. I purchased a couple of Dynaco PAS3 kits back in  
the 1970s (around $120.00 each). I built one and used it for a few  
years. The other got packed away. I uncovered it a couple of years back  
and sold the unassembled kit for $1,200.00. The new owner was thrilled  
(he was a medical student in the 1970s and could not afford one then),  
given it used Telefunken 12UA7 valves. He had valued the valves at  
$400.00 on their own. Dunno about 12AX7s, but I've seen other  
Telefunkens sell for a large chunk of money. That said, I agree with  
your original suggestion to use 7025s. I built a preamp in the late  
1960s using 12AX7s and then swapped them for 7025s. Far quieter.


--  
Trevor Wilson www.rageaudio.com.au

Re: Source for old vacuum tubes - 12AX7
On 9/09/2013 8:27 AM, Trevor Wilson wrote:
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Thanks guys.


Re: Source for old vacuum tubes - 12AX7

"Trevor Wilson"
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** We'll see in a couple of days time  -  backyard dealers are like hungry  
sharks when NOS tubes are offered cheap.

 End users have little chance ......


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** IIRC, the 7025 was a " special quality"  US type made by RCA based on the  
12AX7  -  Fender guitar amps used them heavily through the 1970s.

In the main, they had reduced microphony and AC heater hum  - plus  
consistently lower noise than run of the mill 12AX7s.

However, new ones offered now come from China and Russia so have no link  
with original US made examples.

It is interesting that so many recent model guitar amps I see have DC  
supplies for the preamp valves - which is one sure way to silence that damn  
hum.



....  Phil





Re: Source for old vacuum tubes - 12AX7
On 9/09/2013 4:22 PM, Phil Allison wrote:
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**It's been awhile since I worked on musician amps. I didn't realise  
that they'd moved to DC filaments. It's been common on hi fi amps for  
quite some time, as I'm sure you already know, and, of course, my dearly  
departed 1960s Hitachi clone of a Tektronix 545A (500 Watts  power  
consumption), which used a bunch of 6080 twin triodes for filament  
regulation. All the vertical valves' filaments were operated in series.  
Great CRo to use during the Winter. Not so nice during Summer.


--  
Trevor Wilson www.rageaudio.com.au

Re: Source for old vacuum tubes - 12AX7

"Phil Allison"
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** Bidding finished at  $157.00  for the pair.

Nuts.

I've got a used Siemens ECC82 " silver plate" in good working and appearance  
condition  - wonder what that is worth nowadays  ?



....  Phil



Re: Source for old vacuum tubes - 12AX7
On 11/09/2013 4:37 PM, Phil Allison wrote:
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**Sounds about right.

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**Oh yeah.

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**Dunno. I got a bunch of nifty old valves, including some GE MOV KT88s.  
I'll whack 'em on eBay soon and find out. Back when I used to fix Wasp  
amps, I used to pay 25 Bucks for a KT88. Wish I'd stacked a bunch away.  
Geez, I haven't seen Ron Holden for 20 years. Last time I spoke with  
him, he was an Amway reseller. Shame. Talented guy. I did sell some  
stuff to Gil McPherson about 6 years ago. Another good designer of musos  
amps.

--  
Trevor Wilson www.rageaudio.com.au

Re: Source for old vacuum tubes - 12AX7

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I've got some nice black glass NOS  OC71 if anybody wants.  The Sound Of  
Germnium.  Very exclusive - $200 ?

geoff  



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