Mic Kaczmarczik's TubeInformation - The Blue Guitar

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From SRSN81A@prodigy.com Sat Nov 25 00:18:26 CST 1995 Article: 5760 of alt.guitar.amps Path: geraldo.cc.utexas.edu!cs.utexas.edu!uunet!in1.uu.net!prodigy.com!usenet From: SRSN81A@prodigy.com (Joseph Pampel) Newsgroups: alt.guitar.amps Subject: Re: Easy(?) Tube Rectifier Question Date: 25 Nov 1995 04:16:38 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 39 Distribution: world Message-ID: References: NNTP-Posting-Host: inugap4.news.prodigy.com X-Newsreader: Version 1.2 CXPN06A@prodigy.com (Eric Erickson) wrote: > >I've a '73 Vibrolux Silverface that uses a 5U4 rectifier. Is it possible >(without modification) to advantageously use a different tube? I'm not >concerned with the overall RMS of the amp, JUST THE TONE... You can use any of the 3 "popular" rectifier tubes by simply plugging them in. The 5Y3, 5U4 and 5AR4/GZ34 all pin out the same (effectively). Big difference is how much current each can deliver to the amp, and their internal resistances which effect the voltage drop across them (and thereby the overall B+ level) The 5Y3 is the "weakest", and will make the amp "saggy" or squishy.It will also be overtaxed in a circuit like this and will not live as long as it should. The 5U4 and 5AR4 are both up to the job and differ in two primary ways. #1 the 5AR4 has a smooth turn-on characteristic which is good for your filter caps and tubes since the high voltage 'ramps up' rather than coming on all at once. The 5AR4 has a low internal resistance and your B+ (plate) voltage will likely go up a bit, so you'll want to re-bias the amp to use it. I should say you should re-bias the amp whichever rectifier tube you switch to. The 5U4 has a higher internal resistance and will drop more voltage. If you have been using a 5AR4 and want to drop your B+ voltage a little, a 5U4 is a good start. Tone wise, make sure your amp has good output tubes, a good phase inverter tube (try and find a NOS US made 12AT7) and make sure the amp is biased correctly. Then and only then should you worry about which rectifier tube it uses. The rectifier tube is only an incremental player in the tone equation. Overrated really. The output tubes, phase inverter and bias setting are the biggies, and they get overelooked far too often. If you've never had the amp set up before, you're in for a treat. It's a real eye opener to get an amp biased up correctly if it hasn't been before.. There is a BIG difference between working and working :just right:. Joe Back to JT30 Home
From dawsondc@postoffice.worldnet.att.net Mon Mar 23 13:10:39 CST 1998 Article: 60680 of rec.audio.tubes Path: geraldo.cc.utexas.edu!cs.utexas.edu!news.eng.convex.com!newsgate.duke.edu!nntpout.monmouth.com!newspeer.monmouth.com!news-peer-east.sprintlink.net!newspeer.sprintlink.net!news.sprintlink.net!Sprint!worldnet.att.net!newsadm From: Douglas Dawson Newsgroups: rec.audio.tubes,rec.antiques.radio+phono Subject: Re: 6.3 V vs. 5 V heater Date: Mon, 23 Mar 1998 07:59:17 -0800 Organization: AT&T WorldNet Services Lines: 37 Message-ID: References: Reply-To: dawsondc@postoffice.worldnet.att.net NNTP-Posting-Host: 12.64.38.150 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0C-WorldNet (Win95; I) Xref: geraldo.cc.utexas.edu rec.audio.tubes:60680 rec.antiques.radio+phono:71691 Here's a few more points that no one has touched on yet: 1. The early AC tubes (types '24 & '27, but not type '26) were 2.5 volt heater types. The '26, with its 1.5 volt filament, was a special AC design which attempted to eliminate hum by mutual cancellation of the effects of the electric and magnetic fields from the filament. This required that the choice of filament voltage and current be "just right" in order to get the cancellation effect. 2. The type '80 has a 10 watt filament which would have required 4 amps at 2.5 volts, probably a bit too much for the plug-in socket connection. Therefore it probably seemed reasonable to double the "standard" filament voltage to 5 volts in order to keep the current down to 2 amps. 3. The first 6.3 volt tubes, types '36, '37, '38, etc. were developed for use in automobile receivers when cars had 6 volt batteries. Some radio manufacturers, notably Philco in the US, quickly adopted these for mains-power radios as well. The rest changed over within a few years. The result of these choices, as the earlier commenters have noted, was to establish 5 volts as the "standard" for rectifiers and 6.3 volts for other types. Doug Dawson Claude Frantz wrote: > > It has been a common practice to use a rectifier with a 5 V heater > although the other tubes had 6.3 V heaters. In fact, rectifiers with > a 6.3 V heater exist too. Using a rectifer with direct heating > make it necessary to use a separate winding on the transformer, but > why should the voltage be different ? Any explanation available ? > -- > Claude > (claude@bauv106.bauv.unibw-muenchen.de) > The opinions expressed above represent those of the writer > and not necessarily those of her employer. Back to JT30 Home
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Mic Kaczmarczik's Tube Information
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Svetlana-6550s 07-Nov-1995 11:01 4k
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From wright@uspto.gov Sat Aug 19 20
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From tremolux@aol.com Tue Dec 20 11
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From hap@bnr.ca Fri Mar 1 16:51:56
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: : : What transformer secondary vo
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At continuous DC current of 100mA .
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From stratboy@onramp.nett Sun Dec 1
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From ashinman@chem.ucalgary.ca Wed
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From postmaster@triodeel.com Wed De
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From mookie2112@aol.com Sat Jul 31
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tubes. Very good in the #2 position
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From postmaster@triodeel.com Thu Au
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Organization: Univ of CT Health Cen
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From raydeeohh@aol.com Mon Jan 30 1
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Back to JT30 Home
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From power@wwdc.com Mon Jul 29 10:3
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From SRSN81A@prodigy.com Sat Nov 25
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From postmaster@triodeel.com Sun No
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From rongon@bway.net Tue Jul 9 01:0
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RCA - Very detailed when clean, sli
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From larrysb@aol.comNOspahm Tue Dec
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From meo@rru.com Wed Apr 19 14:02:1
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From SRSN81A@prodigy.com Sat Aug 19
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it!) with a well matched set of GTA
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From Kevin@UPSCALEaudio.com Sun Mar
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From npstewar@eos.ncsu.edu Thu Apr
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Lines: 110 Message-ID: References:
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6: enne-al 9-pin 7 is also a "misce
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From triodeel@ameritech.net Wed Jun
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From ebarbour@netcom.com Sat Aug 26
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From Kevin@UpscaleAudio.com Wed May
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From tremolux@aol.com Sat Oct 1 00:
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it beefier magnetics and they can h
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little gift of a bad trace, a bad L
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From dhaugen9@mail.idt.net Fri Oct
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with the numbers on top in a grey p
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From: jatwood@netcom.com (John Atwo
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Back to JT30 Home
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From jjensen@sirius.com Wed Apr 30
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(2) When the Chinese tried making 6
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Many of Mazda's later tubes were ma
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lack paint. This is a good case for
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coupling in airborne sound to the t
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UPSCALE Audio/Home Theater/Rare Tub
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small, so it could have been plain
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4. The first grid voltage -35 V 5.
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or control grid is sloppy. As you k
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Subject: Re: Tomorrow's tubes? Send
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Mic Kaczmarczik's TubeInformation - The Blue Guitar

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