Williamson amplifier ebay auction
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- I Got the Blues - My New Ebay Auctions...
- "NOS" Vintage amp by Bob Carver/Tim Paravicini
- EL34 tube mono block,circuit copied from williamson amplifier
- Got The Amp Back Today! Silvertone 1482 2016: 54 years in the Making
- Antique Radio Forums
- Festival D-1000
- Standel 25L15?
- Stancor Williamson amp
- How the coronavirus, the internet and tons of money unexpectedly fueled sports cards' biggest boom
I Got the Blues - My New Ebay Auctions...
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Thread starter sleepysurf Start date Aug 21, For those who might have missed this, Bob Carver and Tim Paravicini recently designed a one-of-a-kind set of tube monoblocks, crafted mainly with NOS vintage parts, and auctioned on eBay.
Their description, and ensuing comments are still online, and definitely worth the read Cherian Well-known member. Joined Aug 1, Messages 1, Reaction score 0. Bob donated one set of these amps to carver fest. It will be raffled off so all you carver fans may want to think about going to the Carver fest this year.
Attached is a link. This is the second set Bob has sold on e-bay. Last edited: Aug 21, P Well-known member. Another great produced by Bob Carver. Here's a perfect example of why links to ebay auctions are not allowed. Once that ebay link is dead, this thread will become worthless and that's a shame because it's a great read.
Here's the text from the auction: Vacuum tube monoblock amplifiers watts each Tubular Joe and I just finished building a new pair of these monoblock amplifiers, and here they are.
The story is the same, the names have been changed to protect the innocent. The man with big muscles holding the amplifer is me, Bob Carver. In addition, it is I, the man with the sandwich. It was two summers ago that Tim de Paravicini and I met in a small town in California. We spent three fascinating days discussing vacuum tube power amps and the magic of our mechanical vinyl recording system that somehow, against all odds, is able to deliver music with life and romance that no other system can.
We talked about output stages, phase inverters, front end amplifiers, output transformers, and especially the dynamic characteristics of tube amplifiers playing music. I will never forget those fascinating three days as long as I live. We mused that there have been only four basic designs that have been widely used since the very beginning; the Williamson circuit, the Mullard circuit, the Dynaco pentode-cathodyne circuit and the Stewart Hegeman all pentode circuit.
As the mornings turned into nights and we used up all the napkins on our table drawing amplifier diagrams, a remarkable circuit emerged as Tim held the pen and drew a balanced current-sourced front end, followed by double balanced drivers using a frame grid triode ultimately direct coupled to the grids of the output tubes. Successful collaborative effort. Tim designed the all important current sourced front-end.
Together we designed the output stage, power supply, bias supply, and I designed the driver stage using the frame grid triode. But I'm getting ahead of myself. I've been collecting vintage amplifier parts for a lifetime, always with the notion of making a small museum someday.
But after spending three fascinating days with Tim, I had a change of heart and decided a much better use for them would be to build an amplifier. And here it is. There's more. Every vacuum tube amp in the world suffers from shifting DC operating points, and this unfortunately has remained a functional limitation and maddening sore point for amplifier designers ever since the very beginning of vacuum tubes.
As Tim would say, "Nothing new under the sun", just the same, it's never been done before, and it works flawlessly. If you're still awake, read on. Of the four circuits mentioned earlier, the Mullard circuit is used in Marantz 8B and Model 9 amplifiers, as well as countless others by McIntosh, Eico, and Citation. Heathkit used Williamson almost exclusively, and Dyna used the ubiquitous cathodyne circuit as did hundreds of others. And that was it! Only four! This amp uses all vintage parts except for paint, the chassis and some of the small circuit parts.
Even the transformer covers, tube sockets, and transformers themselves are vintage. Output tubes are Vintage Carver Silver Eagles, double tested, burned in for six weeks and tested again. The best of the best. All are NOS except the Telefunken. Power is an easy watts rms with a power bandwidth from 23 Hz to 45 kHz, frequency response 2 Hz to 85 kHz, and distortion less than 0. Power at clipping is watts. Even more into six ohms. It's been so over designed that I expect it will last at least 50 years without need for service.
In twenty years the front end and driver tubes should be replaced, whether they need replacing or not. Here's the best part: even the output tubes should last 50 years unless they have an unforeseen catastrophic failure. No need to replace them unless they won't bias up. The sound: This amplifier stands with a small handful of the world's great vacuum tube amplifiers.
And beyond: it's elegantly balanced, possesses huge energy storage that vintage designers many of whom were geniuses could only dream of, a DC restorer, and twelve output tubes in all.
Nothing can touch it. The features: Four output terminals, ground, one or two ohms, four ohms, eight ohms. A bias control that sets idling current. A switch that changes the feedback from classical vintage to contemporary. A jack for the bias meter, though with the DC restorer it really never needs to be adjusted. It has built in auto-balance, and a volume control. A power switch with turn-on in-rush current limiters is also included. And finally, a chrome roll bar for the front end tubes.
Hi, Tubular Joe here. Just wanted to let you know of a few aspects and features of these amplifiers. They are hand-wired, point-to-point with star grounds. The tagboards are military-style epoxy with bright silver-plated swaged turret terminals. Hope you like them. Bob here.
If one ever breaks, as long as I'm alive I'll fix it free if you get it to me. Except for the tubes. One last thing. We will autograph the amp to you with your name in gold.
Example: "To our friend John - Enjoy the music! Tim de Paraficini, Bob Carver". Except your name, not John's of course. If you wish. Last edited: Aug 22, Carver, kudos! Nice product! Do you think this amp design will ever be available for purchase on a limited scale, with modern day equivalent parts? Kind of a direct order scenario? Aug A: Hi '-old, Thanks for the kudos! It's a new day and that helps makes my day! I have no plans, none at all, to build these amps with anything except vintage parts from my museum.
Great question. Could I get a copy of that DC circuit later? Email is [email protected] I have some spare Acrosound TOs that might work with it. Thanks for everything. And yes, no problem with the DC restorer.
"NOS" Vintage amp by Bob Carver/Tim Paravicini
Download a 24pp pdf with schematics and technical information regarding all AWA-brand vacuum-tube broadcast audio amplifiers circa Big thanks to PS dot com reader E. Due to a very protective import-taxation scheme in place in Australia until the early s as well as the high cost of shipping imported goods to that country , AWA was highly incentivized to develop its own unique line of broadcast audio equipment for the Australian market. I have personally never seen any of these items myself, and many of the circuits are different than any US broadcast audio components that I am aware of; perhaps there is more of a Telefunken heritage to this kit. All photos in this post credited to E.
EL34 tube mono block,circuit copied from williamson amplifier
Order by:. Available to:. Free Shipping. Fender Acoustasonic 40 Combo Amplifier Used. It's powered by 2x80W of power driving an 8" speaker. It provides 2 channels instrument and microphone and features SFX Stereo Field Expansion effect and digital signal processing with effects select and level. Controls on the instrument channel include gain, treble, mid, bass, string dynamics, feedback notch, and phase reverse.
Got The Amp Back Today! Silvertone 1482 2016: 54 years in the Making
Return to Vintage Audio Equipment. Radio Craftsmen amp info Discussions of vintage tube and transistor audio equipment. Ads are not premitted. Radio Craftsmen amp info by Fred Rice » Feb Wed 07, pm I pulled this amp out of my garage where it sat for many years.
Antique Radio Forums
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Festival D-1000
It's a month before the coronavirus will upend civilization, and Probstein is in a collector's paradise: One room spills over with racks of signed jerseys being prepped for shipping; in another, two dozen employees, sardined at workstations, painstakingly monitor auctions; in Probstein's office, columns of cards on folding tables test gravity with mini helmets littering his desk. Atop the vault sits a Babe Ruth autographed baseball, acknowledged with a halfhearted nod as Probstein rummages below. The Mantles are the showstoppers. Two could buy a private island. But vintage cards yielding top dollar is nothing new. What is new and hard to fathom: Over the past half-decade, even now amid a pandemic that's decimated the American economy, contemporary sports cards have attracted gargantuan sums from high-rolling investors.
Standel 25L15?
David, aka Grumpy, needs our help. Great news. David is home! It was quite the ordeal to get him home and into the house, but it is done.
Stancor Williamson amp
RELATED VIDEO: stancor williamson amplifiersStupid fraud? Another 25A owner, m6 Wonder whether you can support me this Friday. Still in Japan?? Enjoy the party la.
How the coronavirus, the internet and tons of money unexpectedly fueled sports cards' biggest boom
Weird failure with cheap Shugang KT Thought I'd share this one so others could laugh at my misery Also no voltage drop on the cathode resistor. Powered off, let things cool, took careful stock, everything looks ok. I powered up again, with the voltmeter still on the control grid.
View Full Version : Bargains on ebay? Not to my taste though. Not to mine either a tad Dr Who looking but I bet they sound great with some heavy weight vintage gear behind them.
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