http://stvnscott.websitetoolbox.com Tube Amp & Guitar Forum 60 Sat, 21 Nov 2009 15:29:47 GMT http://stvnscott.websitetoolbox.com/post?id=3803974 Hi All, First post here, hopefully you experts out there can help me.<br>I brought a Fender Bassman Reissue home from Dubai and it has the 220V power transformer. I ordered a 120V power transformer to replace it so I can use it here in the US but the replacement has fewer wires than the one in the amp!<br><br>I figured this would be a pretty straightforward job but Im pretty confused.<br>The original transformer has the following wires:<br>blk-grn<br>blk-red<br>white<br>black<br>blk-yel<br><br>yellow<br>yellow<br>red<br>red<br>green<br>green<br>red-yel<br>red-blu<br><br>The replacement has the following:<br><br>black<br>white<br><br>yellow<br>yellow<br>red<br>red<br>green<br>green<br>red-yel<br>red-blu<br><br>As you can see, the replacement is missing the blk-grn, blk-red, and blk-yel wires. Is it ok to just plug in the rest and not worry about these?<br><br>Also, the wires that are the same color (i.e. the two red wires, two black wires, two yellow wires) I can assume that they can be plugged in to either slot wihout a problem. Is this right?<br><br>Thanks in advance!<br>Max<br><br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3803974 Tue, 10 Nov 2009 21:54:13 GMT maxneu http://stvnscott.websitetoolbox.com/post?id=3700786 Steven,<br><br>Why won't you respond to my requests for an update on my amp?<br>I have been very patient...please respond.<br>Don't just delete my messages...I am&nbsp; a customer who has<br>paid you with hard earned dollars.<br><br>Jim Boone<br><br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3700786 Wed, 07 Oct 2009 00:25:45 GMT Jim_Boone http://stvnscott.websitetoolbox.com/post?id=3691464 I have a marshall TSL-100c, and I dont like how much pre amp gain is being produced, the sound it very abrupt almost and its not what im looking for. <BR>So im asking you guys if I could just take one pre-amp tube out? and play it that way, or does it screw up the amplifier.<BR>and if so, is there another way to lower how much pre amp gain there is, thankyou.<BR> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3691464 Wed, 30 Sep 2009 23:55:29 GMT leveckian http://stvnscott.websitetoolbox.com/post?id=3629061 thinking of a G12M greenback in my 5e3 instead of the Weber Sig12S (a bit to bright in the highs).&nbsp; looking for opinions from anyone that has used one in their's and thoughts on the tone.&nbsp;&nbsp; thanks<br>steve<br>sorry, i noticed i posted this in the wrong catagory--<br><br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3629061 Thur, 20 Aug 2009 21:04:56 GMT 320blues http://stvnscott.websitetoolbox.com/post?id=3629052 i&nbsp; bought a prebuilt kit from someone and want to "upgrade" it from the metal film resistors and cheaper signal/coupling caps and put in the proper grounding scheme (he grounded EVERYTHING to a single ground bar and to a Xformer bolt!) &nbsp; in the&nbsp; S2 volume pot wiring, the pots are mixed with 2 220K resistors.&nbsp; what is the advantage of this?&nbsp; more headroom?&nbsp; just a smoother increase in volume? i'm one that likes the interaction between the channels and volume pots/tone control in the 5e3.&nbsp; a little extra control over the volume without an attenuator would be great.&nbsp; thanks.<br>steve<br><br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3629052 Thur, 20 Aug 2009 21:00:00 GMT 320blues http://stvnscott.websitetoolbox.com/post?id=3622097 Hey guys I hope you can help me.<br><br>I built this marshall 20watt amp, great amp.<br><br>The other day the amp started humming more like buzzing, very loudly.<br><br>It happens as soon as I switch the amp on and the tubes warm up. I know that the buzz is comeing from&nbsp; the input side of the amp because when I remove the two ecc83's then the buzz dissapears. All resistors work and caps&nbsp; my tubes are also fine so are the transformers. All connections are also solid.<br><br>Can anyone help me please?<br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3622097 Sun, 16 Aug 2009 12:16:33 GMT skullk1 http://stvnscott.websitetoolbox.com/post?id=3611577 Hey guys, first post on the forum!<br /><br><br /><br>I have a Fender blues junior NOS 15W 1x12. I bought it (partially) used... owned it for about two years... Have treated it very nicely, but with one mishap: after I purchased it, I took it to a show and it apparently got banged up because it started to sound funny. Got it fixed and ever since then, no issues...<br /><br><br /><br>There is a strange harmonic noise produced when I'm playing guitar. When I pluck a note, I hear the note along with a chorusy, detuned octave note above the one I'm playing. It's as if I'm literally playing through a strange detune/chorus pedal. And it's more apparent on the higher notes. If I kill the tone nob on the guitar, naturally I dont' hear it because its a high frequency noise.<br /><br><br /><br>I've done some superficial troubleshooting myself, like see if the reverb is doing it, turn off the FAT switch, turn it on and off... I can't pin point it.. so it's gotta be an internal thing (which I have no expertise with.)<br /><br><br /><br>Is this a common tube amp issue? Anyone know how to fix this? An expensive repair?<br /><br><br /><br>THANKS<br /><br><br /><br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3611577 Sun, 09 Aug 2009 18:16:44 GMT brianwflood http://stvnscott.websitetoolbox.com/post?id=3594400 I recently acquired a 1962 Vox AC4 in sad but original shape. When turned on it produces an extremely&nbsp;loud hum from the speaker, almost like a shorted cord. When a guitar is plugged it passes the signal but is&nbsp;un-useable because of the hum.&nbsp;I've replaced the preamp and power tube with new ones and have a new rectifier on hand but haven't tried it yet.&nbsp;Anybody have any suggestions on possible causes ? Filter cap, bad ground ?<BR><BR>Thanks&nbsp;<br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3594400 Wed, 29 Jul 2009 17:01:32 GMT BillB http://stvnscott.websitetoolbox.com/post?id=3515095 Hi,<br /><br>Im new to the forum, I planning to build a new amp. A Based around a Blues Jr. <br /><br>Does anyone know where I maybe able to track down a layout diagram for a hand wired Jr? <br /><br>I have had a attempt of making one but don't think it is the most correct way!<br /><br>Also has anyone used a 5e3 rectifier on a blues jr?<br /><br><br /><br>Any idea or tips on the project would be greatly appreciated.<br /><br><br /><br>Thanks<br /><br>Dan <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3515095 Sun, 07 Jun 2009 09:47:16 GMT danmac http://stvnscott.websitetoolbox.com/post?id=3469125 VJ fried r10 and r14. I just bought the VJ and it has a Hammond 125ESE transformer in it. The guy used it the day he sent it and told me he fried it. I had another board and threw it in and now it works but makes a bad humm which gets louder as the volume is turned up! The board he had in it has a fried r10 and r14 resistors. Does anyone know why these cooked? All else looks good and I bought two 1K 5 watt cement resistors and two 270r 3watt resistors hoping they could be used for r10 and r14. Does anyone know if they will work and which ones go where? I also have the s2 kit and BITMO tone kit with it. Will the BITMO and S2 work with each other? Any advice I can use! HELP! <br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3469125 Sun, 10 May 2009 17:23:02 GMT eagleeye http://stvnscott.websitetoolbox.com/post?id=3404240 Hello all this is my first post!<br /><br><br /><br>I am about to build a preamp that I want to use to take a 1/4" keyboard line level signal and drive a Leslie 147 amplifier with it. I want to build the preamp using a 12AX7 and 12BH7 based on the design of a Hammond Organ preamp. Here is the schematic to the Hammond Preamp I am going to build:<br /><br> <br /><br><a href="http://www.captain-foldback.com/Hammond_sub/schematics/ao28.jpg" target="_blank">http://www.captain-foldback.com/Hammond_sub/schematics/ao28.jpg</a><br /><br><br /><br>I want to build from C6 to the output transformer. I don't need anything other than that. Would it be better for me to use this circuit or design a circuit from scratch? If I did decide to use this circuit, would it be ok if I used a 250-0-250V power transformer or would I have to use a 340-0-340V transformer that is in the schematic. Also, would it be better to not use an output transformer like in the schematic? Here is a schematic of the Leslie 147 power amp that I am driving:<br /><br><br /><br><a href="http://www.captain-foldback.com/Leslie_sub/Leslie_schematics/147.GIF" target="_blank">http://www.captain-foldback.com/Leslie_sub/Leslie_schematics/147.GIF</a><br /><br><br /><br>Please keep in mind that the Leslie was designed to go with this preamp schematic. I am open to any and all suggestions. I am mainly interested in whether or not I can build the 12AX7/12BH7 part of the Hammond preamp using a 250-0-250V transformer to save on cost, size and weight. <br /><br><br /><br>Thanks for all replies! <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3404240 Fri, 03 Apr 2009 21:37:20 GMT jordankersten http://stvnscott.websitetoolbox.com/post?id=3332178 <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Arial;" lang="RO">Hello</span></p> <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Arial;" lang="RO"> </span></p> <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Arial;" lang="RO">What happens if I do a short in the output transformer secondary to tube amplifiers?</span></p> <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Arial;" lang="RO">The transformer output or final tubes burned?</span></p> <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Arial;" lang="RO">See picture:</span></p> <img src="http://www.acelayouts.com/uploads/images/2009-02-26/eHw9ZKz8T7.png"><br><br><br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3332178 Fri, 27 Feb 2009 16:33:25 GMT cornelflex http://stvnscott.websitetoolbox.com/post?id=3295329 <P>Hi everyone,</P><P>I just bought an Epiphone Valve Standard last week brand new, it was the last one in the shop. I love everything about the amp except for a few inconsistencies. This is my first tube amp so i didn't know what to expect. I've looked on some forums about this amp and a few other people have had the same problem with hum.</P><P>It's really weird because when i start using the amp there isn't much feedback, then after 30 mins or so(when the tubes are hot) it makes this real annoying hum. When i put the gain on 0 the hum is still there and it increases with MV knob.</P><P>Also sometimes when i switch to standby it makes a pop noise that doesn't good for the speakers(or wherever it's coming from).</P><P>It may be the tubes, but during random times i can hear a burning sound inside the amp. I'm just curious as to whether all these things are common in tube amps and what can i do to fix it. Or should i ring up the guitar shop from where i bought it and ask for a refund.</P><P>Thanks alot,<BR>Ben.</P><P></P> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3295329 Thur, 12 Feb 2009 01:46:03 GMT benny_boi http://stvnscott.websitetoolbox.com/post?id=3195163 <P>I have a 100 watt head that has 4 el34s and 3 12ax7s, the el34s are compatible with 6550s. This is my question, when ordering a matched quad set of el34s electro harmonix has 3 choices of soft, med, &amp; hard while groove tube has low 1-3 gt, med 4-7 gt, or high 8-10 gt. which of these are the best for my amp and what are the differences?</P> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=3195163 Mon, 29 Dec 2008 21:17:29 GMT CRATEHEAD http://stvnscott.websitetoolbox.com/post?id=2944155 Hi, recently got a 15 Watt Orange Tube amp.&nbsp; I want to use it for both&nbsp;rythum and lead Playing, but I don't want to be twisting knobs in the middle of a song.&nbsp; And I dont want to use a distortion box because the amp already has great distortion. Does anyone know of an inexpensive gadget that would tweak your amp's volume and gain remotely?<br><br>thanks, Luke<br> <p>Forum: <a href="http://stvnscott.websitetoolbox.com/?forum=45280">Technical Discussion</a> http://stvnscott.websitetoolbox.com/post?id=2944155 Tue, 02 Sep 2008 19:52:45 GMT lukebradley