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Old 20th January 2009, 02:06 AM   #11
Apex Jr is offline Apex Jr  United States
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Location: Torrance, Calif
Anatech...
I'm a one man operation and try to compete with the
big guys... I've been doing the surplus stuff all my life
Well, since I was 8 years old....( worked for my DaD)
I know what people are looking for and it's getting harder
and harder to find stuff. But I keep trying.

I do have a warehouse that is open to look at, but by
appointment only and am located by the 2 and 210 freeways
in Southern California.

There are a few ways to ship to Canada, all depending
on the weight. Least expensive is the USPS priority mail
international flat rate envelope... Only up 3 lbs 15 oz.....
Then the Flat rate small box... TODAY they yet rasied
the price, and lastly the large flat rate box also just today
raising the price. I have learned my lesson with UPS
and do NOT use UPS to ship to Canada.

And now lastly...
I do accept Visa, M/C and AmEx with a 3% processing fee
and PayPal with a 5% fee...

Steve @ Apex Jr.
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Old 20th January 2009, 02:34 AM   #12
anatech is offline anatech  Canada
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Hi Steve,
All the more reason to support you, right?

I did read the "by appointment" thing. Same as me. One man (okay, 0.65 % of a man) operation, by appointment. I am normally here and my basement only looks like a messy warehouse.

Your credit card terms are fair and freedom from UPS is wonderful. No one can change what USPS does, so that's okay. I fully understand the 5% PayPal surcharge.

Thank you Steve, now I just have to become solvent again.

Best, Chris
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Old 20th January 2009, 02:54 AM   #13
Apex Jr is offline Apex Jr  United States
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Yes. I work late...
Heres a blog about me and just one of my aisles

http://thestereoclub.blogspot.com/20...ffordable.html

I do stock quite a bit of stuff..
OK in the main warehose I only have 1600 sq ft
BUT, my other warehouses have 1200 Sq ft with a
14ft celing and sharing 500 sq ft in a 1200ft building too

Steve @ Apex Jr.
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Old 20th January 2009, 03:31 AM   #14
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Location: Maui, Hawai'i, USA
Stuey,

Don't use the 6AQ5.  Although otherwise cool, they are (depending on example) somewhere between moderately and fabulously microphonic.  I'm now using an otherwise almost identical (in characteristics) but completely nonmicrophonic tube, the 6T4.  Same socket, BTW.

Click the image to open in full size.

Almost same circuit, but a little lower voltage due to the very restrictive Vh-k rating of the 6T4.  This is definitely the ne plus ultra Mœbius.

Aloha,

Poinz
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Old 20th January 2009, 08:38 AM   #15
Stuey is offline Stuey  Australia
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Thanks Poinz. I knew about your change to the 6T4, but was attracted by the fact that the 6AQ5 is available everywhere. Even Australia!!!

Seriously, though, I'll take your advice.

Thanks to everyone for the info. Steve, cheers for the heads up.

Cheers

Stu
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Old 20th January 2009, 03:50 PM   #16
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6T4s are very available.  You're just not going to find them at boutique vendors (at least not yet :^).  You got to ask your bulk vendors, those guys with warehouses full of old orphan teevee tubes.  They'll tell you, 'Heck yah, how many you want?'.  Get at least a dozen; twenty or thirty is better (if they want over a couple bucks each for quantity, tell 'em to be reasonable), so you can test up and match.  You'll have enough for the rest of your natural life for the price of a good NOS 6SN7. I got 170 of them from Jack at The Tube Center, all RCAs in clean boxes, for $2.50 each.

Aloha,

Poinz
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Old 20th January 2009, 09:44 PM   #17
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Quote:
Originally posted by Poindexter
Don't use the 6AQ5 ... I'm now using an otherwise almost identical (in characteristics) but completely nonmicrophonic tube, the 6T4.
Triode connected, the 6AQ5 has a similar mu and rp, but it also has 3x the plate dissipation and double the heater current. It is basically a EL84 with a slightly lower dissipation and max voltage.

Poinz, why the 18K resistor on the output? Seems a little low.

Oh, also, I called Amveco and the primaries are would bifilar, meaning that the only insulation from your primary to your secondary is the enamel on the wire.
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Old 21st January 2009, 01:52 AM   #18
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All that you say is true.  I enjoy the lesser heater current, and the plate dissipation rating is not germane, since I'm burning 1.5 - 1.6 watts per device.  The salient characteristic for me is microphony. The 6AQ5 has those big cylindrical plates, and most of them ring like a bell.  I wonder if it's a problem in power amp service, they never were a very popular device.

Hm, maybe I should find another transformer solution, given what you discovered.  I've never had any problem, but two coats of varnish ain't a 230v insulation.  I would assume that, being bifilar, the induced voltage in the 'secondary' primary would be in inverse polarity.  I have in the past advised those who are nervous about the unconventional connection to just get a 120V Hammond, since 65V/device still yields plenty of swing.

Mahalo,

Poinz
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Old 21st January 2009, 02:14 AM   #19
anatech is offline anatech  Canada
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Hi Poindexter,
The Heathkit EA-2 used these output tubes (6AQ5A). The 6BQ5A offered greater output power in the specs war.

Keep in mind they were intended to be in the output where there is low gain. As far as cylindrical plates tending to be microphonic, I'm not so sure of that. There are tubes built similar to that used in signal positions. Besides, a cylinder should be very stiff. There are mica supports to damp each end to some degree.

Want to see microphonic? Nuvistors can really pick up mechanical noise.

What you need is a garden variety, low mu triode. Time to go hunting in your favorite tube manual. You probably want something other than a power output tube. Capacitance may become a problem with the larger tubes.

-Chris
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Old 21st January 2009, 02:39 AM   #20
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Quote:
Originally posted by Poindexter
but two coats of varnish ain't a 230v insulation.
They did tell me that they are hipot tested to 500V. Probably not enough to make it safe, but something anyway.
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