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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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14th Aug 2006, 6:05 pm | #1 |
Pentode
Join Date: Jun 2006
Location: Malaga, Spain.
Posts: 235
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OTT-813 etc
Not sure if this is the right place to post this link but I thought that this guys projects were truly OTT. Made me think about building a 3 valve TRF with 813s and a 30W class A audio O/P Wow!!
http://www.wynterarchtops.com/radios...project-05.htm Cheers, Mike. |
14th Aug 2006, 6:20 pm | #2 |
Dekatron
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,517
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Re: OTT-813 etc
Hmm, He seems a bit on the mad side to me!
I love it!!! Cheers Sean
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Engineers make things work and have spare bits when finished |
14th Aug 2006, 6:36 pm | #3 |
Octode
Join Date: Dec 2005
Location: Near Stowmarket, Suffolk, UK.
Posts: 1,962
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Re: OTT-813 etc
I don't know why but I love it! It looks fantastic as well. Josh.
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14th Aug 2006, 6:50 pm | #4 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: OTT-813 etc
It just demonstrates what I've always believed: electronics enthusiasts are an incredibly creative collection of people!
Al / G8DLH |
17th Aug 2006, 12:42 pm | #5 |
Rest in Peace
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 2,234
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Re: OTT-813 etc
Wierd.
Biggles. |
17th Aug 2006, 2:13 pm | #6 |
Hexode
Join Date: Apr 2003
Location: Higham-on-the-Hill, Leicestershire, UK.
Posts: 338
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Re: OTT-813 etc
Wow! All of his projects look amazing! They are extremely well built and so elegant to look at. Puts my few cobbled together creations to shame.
Sam
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Can he lead a Normal life, Doctor? No, he will be ... an Engineer. |
17th Aug 2006, 2:33 pm | #7 |
Retired Dormant Member
Join Date: Mar 2003
Location: Birmingham, West Midlands, UK.
Posts: 785
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Re: OTT-813 etc
What's the performance like using that monster valve in a regenerative circuit?
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17th Aug 2006, 3:27 pm | #8 |
Rest in Peace
Join Date: Feb 2004
Location: Hexham, Northumberland, UK.
Posts: 2,234
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Re: OTT-813 etc
Well if the valve in that regen RX is used at it's full rating, and is allowed to oscillate, it could probably black out a whole county's receivers acting like a transmitter I reckon!
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17th Aug 2006, 4:07 pm | #9 |
Nonode
Join Date: May 2005
Location: Godalming, Surrey, UK.
Posts: 2,593
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Re: OTT-813 etc
Umm,
I think it's hideous ! But looks well built, the mahogany woodwork in particular is nicely done His 'Crystal Lighthouse' is a much prettier piece and probably worth its $250 price tag. Howard Last edited by howard; 17th Aug 2006 at 4:14 pm. |
17th Aug 2006, 4:16 pm | #10 | |
Retired Dormant Member
Join Date: May 2005
Location: Aarhus, Denmark
Posts: 281
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Re: OTT-813 etc
Quote:
Secondarily, I would know of a few pieces of wood, which would catch alight if the 813 ran all out. I have heard about a number of these types of projects over time, and most people with some experience with regenerative receivers says these 'monster contraptions' are more show than go. Haven't actually tried making one myself tough, so I have no opinion on the matter. Frank N. |
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5th Oct 2006, 12:30 am | #11 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: OTT-813 etc
Whilst on the Topic of 813 amplifiers, here is how to do it properly . . . .
http://amfone.net/index.php?ind=gall...on_view&idev=4 from one of my favourite Web Sites. Al. |
5th Oct 2006, 4:00 pm | #12 |
Pentode
Join Date: Jun 2006
Location: Malaga, Spain.
Posts: 235
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Re: OTT-813 etc
Hi, I don't know about doing it properly, I suppose if I wanted 1500W on 11m it would be an option I guess.The only HF Tx experience I had was with a 2-30 MHz broadband 150 watt driver stage that used 12 4CX250s as a distributed load amplifier. I thought that the smoothing cap mounting in the pics was quite nifty and I may use a similar arrangement on my stereo 813 PP audio amp. I'm still trying to sort out the 10V 20A DC heater supply after picking up a 12V 300VA tranny. I found an interesting cct based on an LM78xx and a bunch of 2N2955s.
Cheers, Mike. |