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 Post subject: Hiker's One -- tube questions !
PostPosted: Jun Sat 05, 2010 6:12 pm 
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Hi fellows ---

I did some puttering around online here, and stumbled across the little Hiker's One circuit -- http://www.oldradios.co.nz/hikers/ .

Has anybody built this thing ? If so, how good of a performer is it ? From the look of it, I like the set, very few parts !

What I'm curious about, anybody know of some more modern tube equivalents ? Some of these older 2-digit number tubes are spendy ! What I'm looking for would be a 50's or so era equivalent, preferrably one with the ubiquitous octal socket to make searching for the older and harder to get parts minimal.

Thanks in advance !

Tom

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PostPosted: Jun Sat 05, 2010 7:11 pm 
Silent Key

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Location: Sandpoint, IDAHO 83864
Several members here have built them. One ex-member who can not post on the ARF any more has one and he says it works like a charm.

However, it was designed around the #49 tube, which is a filament type dual grid tube that saw little use in "farm" sets back in the 1930's. The 49 seems to be a bit hard to find, but it supposedly outperforms many other tube types when used in the space charge circuit of the Hiker's Companion set.
Curt

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PostPosted: Jun Sat 05, 2010 7:36 pm 
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Google "Space charge tubes" and a plethora of articles and tube lists will appear. FWIK Most 12v auto radio tubes from the hybrid design era will work, more or less.

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PostPosted: Jun Sat 05, 2010 8:14 pm 
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The only article I know of on the topic http://www.junkbox.com/electronics/lowv ... ubes.shtml

If there are others, I would be interested too :)

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 Post subject:
PostPosted: Jun Sat 05, 2010 11:18 pm 
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Tom,

Your article from OZ mentions later variations of the Hiker's using one and two 1Q5 octals. These are beam power tubes originally meant for driving a speaker. The more common 3Q5 is almost the same, but with a center tapped 2.8V filament. A typical tube vendor wants $3.00 each, for either version, "NIB".

Depending on your objectives, the tube's filament, or heater power may be important. If you plan to actually use the radio, and power it from batteries, you may want to choose tubes with low filament power.

The original 49 is not too bad, at 2V x 120mA. The 1Q5 draws 1.4V x 100mA. However, there are plenty of battery tubes that run on 1.4V x 50 mA. The 1N5GT is an octal pentode with a grid cap that is also selling for around $3.00. It's a bit more in the older "G" style bottle. A 3A8GT is another possibility, a Diode - Triode - Pentode that might replace both of the tubes in the Two Tube Hiker's set. Not pricey, and only 1.4V x 100mA.

The hybrid car radio tubes such as the 12K5 are really neat, but you don't want to have to carry the A battery yourself.

Hope these notions are useful to you.

Ted


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 Post subject:
PostPosted: Jun Sat 05, 2010 11:19 pm 
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Check "Homebrew" page at the site below - for 2 and 3 tube versions. ("Homebrew" links at top and bottom of page).
http://www.sparkbench.com/
and here,
http://makearadio.com/tube/hikers1.php


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 Post subject:
PostPosted: Jun Sun 06, 2010 5:33 am 
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Hi there gentlemen---

Ted, thank you for pointing that out ! I must have been so absorbed with the original circuit that the little one with the octal tube just slipped by without notice ! I'll keep an eye out for some of those 1C5's here !!!

Keeper -- very informative article ! Definitely gonna bookmark that one ! Should I run across anything like that one, I'll PM you and send the link to ya !

Curt-- many thanks for the note ! Sounds like a good little set to gather parts for ! I'll look up the data for that 49, and the octal one too !

Many thanks everyone !

Tom

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 Post subject:
PostPosted: Jun Sun 06, 2010 6:19 am 
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Tom,
I've built a Hiker's Two with 3Q5 tubes. Worked very well. Gary put it on his site here:
http://www.oldradios.co.nz/hikers/kb7nrn/index.htm

My orginal page is here:
http://home.centurytel.net/radiosbykb7n ... spage3.htm

And lets not forget the MRL One Tube Low Voltage Receiver:
http://home.centurytel.net/radiosbykb7n ... Regen1.htm

I do like the #49 tube. Here is the predecessor to the Hikers series. The Pop Mechanix space charge AM reciever & SW receiver.
http://www.antiqueradios.com/forums/vie ... +mechanics

http://www.antiqueradios.com/forums/vie ... hikers+two

All the original Pop Mechanix articles were scanned and Gary put them on his Oldradios.co.nz site. I think I even gave him a scan of the first space charge receiver by Roy Usher, VE4EA, from 1935. That one article spawned the Pop Mechanix and Hikers series.

Hope this helps.
John


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 Post subject:
PostPosted: Jun Mon 07, 2010 6:53 pm 
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Hi there John---

WOW !!! :shock: FANTASTIC LOOKING RADIOS !!! Those are truly works of art !

I really like the construction on them, it's classic !

Thank you for the note here, I'll keep my eyes peeled then for more of the 3Q5 and similar tubes !

Congrats on a job very well done ! I'd have no problem recommending any or all of those radios as being museum-grade without a doubt !

Regards--

Tom

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 Post subject:
PostPosted: Jun Mon 07, 2010 8:44 pm 
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Thanks Tom.

But you really need to go to Bill Meachum's site to see some magnificent homebrew radios. golfguru posted the link above but here it is again. http://www.sparkbench.com/

If Bill can't find the part he needs he usually ends up making it!
When I want to be inspired I look at his sets.

John


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 Post subject: Bill Meachum
PostPosted: Jun Mon 07, 2010 8:50 pm 
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Location: Burlington, Ontario, Canada
Is he still around, his site seems to have fallen inactive, last updated 2 years ago after regular updates?



War Bird Radio wrote:
Thanks Tom.

But you really need to go to Bill Meachum's site to see some magnificent homebrew radios. golfguru posted the link above but here it is again. http://www.sparkbench.com/

If Bill can't find the part he needs he usually ends up making it!
When I want to be inspired I look at his sets.

John

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 Post subject:
PostPosted: Jun Mon 07, 2010 9:13 pm 
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Bill M. is alive, well and still making homebrews. He posts at Dave Schmarder's homebrew site - "The RadioBoard Forums".
http://theradioboard.com/rb/


Last edited by golfguru on Jun Mon 07, 2010 11:08 pm, edited 2 times in total.

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 Post subject:
PostPosted: Jun Mon 07, 2010 9:15 pm 
Silent Key

Joined: Jan Thu 01, 1970 1:00 am
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Location: Sandpoint, IDAHO 83864
I have had an e-mail exchange with him just a week or so ago. He does read the ARF postings so he probably knows we are talking about him.
Curt

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 Post subject:
PostPosted: Jun Mon 07, 2010 9:32 pm 
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8) Thanks, never know these days. A lot of web sites have disappeared over time, and their respective owners too.

That cigar box radio looks like a fun build :)

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 Post subject:
PostPosted: Jun Tue 08, 2010 10:29 pm 
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Hi, you might want to look at the sub miniature CK6088 tube. 1.25V filament at 20ma makes it perfect for one NiMH AA battery. A pair of these should make a nice two tube regen that is easy on batteries and physically small. Just an idea.


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