![]() If the turns ratio is 1:3 the impedance ratio is 1:9 or 10,000 to 90,000 in this case as stated in the spec. The impedance ratio of any transformer is proportional to the square of the turns ratio. The difference in impedance is strictly turns ratio related, wire size, resistance not a serious factor. Response curves can be modified with RC networks but this usually isn't within the abilities of the average tech, me included, and isn't simple to do. The immediate consequences of the higher ratio will be to drive the output tubes a bit harder at THE SAME VOLUME CONTROL SETTING, and the opposite at a lower ratio. You should not need to modify any other component values due to small changes in ratio. The only way to be sure, so far as I know, is to run a curve on the original amp. Sorry, I have no expertise in this area re guitar amps but if this is the case here, we are in a critical area. Then again, I understand that guitar amps may have the response "tweaked" to create a unigue sound, and if this is the case, the transformer can be an important factor in this parameter. It has been my experience that these are weak in the bass area. The Hammond unit mentioned says: "Minimum frequenct response: 50 Hz.-13 kHz." No mention of roll-off, etc. Is this overall, in other words, it will fit into a 1.5" cube? It is small as yours is small, I think! You say 1.5" square. The 124B transformer appears to fit the need. We are in a bit of a gray area as far as I'm concerned. My question is If the winding ratio is roughly 1:1.3 why is there such a difference in Impedance between the two sides? Size of wire? Here is the specs on that one:īear with me ,I want to learn. Second question is: suggests the Hammond PT 124b. 2 ratio change the sound? Will it drive the 6V6 tubes harder? Enough to sound different? Also, then, would a 1:1 Ratio work as well if it is not that critical? I am not savy enough to make accompanying resistor / cap changes to compensate for different turn ratios. Two questions- how will the difference in. Jkaetzjr stated that the exact ratio is not that critical and that a 1:1.5 will work as good as a 1:1.3. I ask the following questions becuase I am trying to learn. I know the trannys will be a factor in determining the outcome of the tone when finished. I love the tone so want to follow as closely as possible the circuit. I am copying the circuit of an Amp I have already so I can mod the circuit without destroying the originality of the vintage amp. The only other numbers on the tranny are the Manufacture/Date numbers, 606-7836. The tranny number on the schematic, 026847, is a Fender Musical Instruments Co number (I think). The transformer was made by Woodward-Schumacher and is in a 1978 Fender Musicmaster Bass guitar amp. With 119.7 volts AC at the primary I got 157.5 volts out the secondary end to end and 78.5V from center tap.Ĭan anyone tell me the windings Ratio of this tranny and what its proper name is? Where can I get a suitable replacement in-expensive? Will the replacement have to be exact? The tapped secondary measured 3.06 end to end. ![]() I took some Ohm/Voltage measurements with a standard ohm meter while the tranny was totally disconnected. I believe the tranny is a Audio Interstage Transformer but not sure that is the proper name. I have included a link to the schematic of the Amplifier. they hit the speaker.I need to find a replacement for a no longer made transformer in a 1978 Amplifier. One thing tho - I have heard from a few who just want the cab for their own chassis, but the clearances are so close that different transformers probably won't work. Just get a better sound than the stock CTS 12 most all of these had. Rolled off sound or spiky treble with the wide range of the tone control. We added kool tiltback legs, installed a Jensen Neo 12 and found a This is the smallest cab you can stuff a 12 into and it's only 2-3 inches taller than a Champ plus badass back grille cloth w/ white piping. Make a custom one-off cab that’s a few inches shorter than their normalĬhamp cab and the only one like it. So I had the chassis fully restored over $200. And a 12" speaker has it over the Princeton's 10". But it’s not quite up in Princeton range. Gets loud and I am sure has the distortion all goin’ on but haven’t tried it ![]() Lo-volume clean players like me, Champ w/ the little 8” speaker just don’t cut itĪnd not loud enough staying in clean range. Watts is the sweet spot right between 6 w. I realized a while ago that the 2-6AQ5 Musicmaster Bass 9 I spent a smallįortune on all this and won’t nearly break even but that just comes with being a Wear, and junky original speaker in the cheap cab, etc. Sure you can get one of these amps, unserviced, with cosmetic This Musicmaster Bass amp is like no other. ![]()
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