It was introduced in 1951, primarily targeted for bass guitar players and promoted as a bass amp for the Fender Precision Bass guitar, the first mass-produced electric bass guitar ever. Either way, they settled on the exact circuit that is in this 1960 Bassman which is so popular on YouTube. The Kay Model T-1 Tremolo is a very simple circuit. They were relatively untouched when I purchased them so all of the repairs and changes have been done by me. Personally we have experienced good results with a 1. New Orange Drops didn't cut it. If you take this worth a grain of salt from a first time poster too it'll save you time and a lot of money.
They all probably germanium devices. Presence pot on the schematic is 5K Linear: 1959 has 25K Linear with 4. The tube charts are not very useful for determining the circuit model. Always scan any information downloaded from the internet with an up to date virus scanner before opening the downloaded information. I had read somewhere when Fender was working on the design of the Reissue, they went through all of the circuit iterations on file to find the best sounding one and settled on the circuit that is exactly like my 1960 Bassman.
Pull V1 or V3 preamp tubes If you are a guitarist and use only the the normal channel, you can get a slight increase of preamp gain and volume on a given knob setting by pulling the V1 bass channel preamp tube. My question is: which color is the positive vs. Where to install footpedal or switch? The diode and transistor types are unknown. The Bassman has significantly influenced the whole guitar amp industry since it was introduced. It may effect the resale value of the amp even though it's an improvement. The more current that is flowing, the higher cathode voltage. A subsonic filter prevents subaudible energy from reducing dynamic headroom and distorting the bass.
If so, read more about the cap in the next bullet point. This Website contains a compilation of information already available elsewhere on the internet and therefore considered to be in the public domain. It could technically sound identical when you are done. Connected to an external power supply ±2. It is in fact so simple that we recommend everyone to try it. However, we do not accept any liability for any loss, damage or inconvenience, of any kind, as a result of downloading any information from this site. But my point was I can make it sound awesome with just a few changes.
The amp is a reissue from the late 90s and sounds really good. But dumb ol' me forgot to write down how the speakers were originally wired before I took it apart. Additionally we apply a couple of mods to get more compression, sag and breakup at lower volumes. If one experiences more noise with pulling one tube, we suggest to put it back. When switch S2 is closed, the boost is added. I am pretty sure the speakers are 32 ohms and they are original. The amp is a reissue from the late 90s and sounds really good.
I will say if the amp idles noisily compared to similar amps with an experienced ear making the judgement , i'll bet a super cleanly dressed rewire will make it quieter. Finally we point out location of components in the physical layout diagram. Hence, the voltage is fixed at zero. Many players are happy with the default 6. See picture below for example knob settings. Transistors Q2 and Q3, along with the surrounding components, form this second-order, low-pass, anti-aliasing filter. We think that the cathode bias circuit design of the 5e3 works very well in the Bassman.
All the downloadable content on this website has been scanned thoroughly for viruses. Here's my list of things to do to get period correct performance. I say go for it. A subwoofer provides two main advantages : First, it provides a dramatic improvement in bass, and second, it improves the higher frequencies by letting you turn down the bass frequencies that are fed to the other speakers. However, there is still a noticable effect in the Bassman since pulling a preamp tube reduces the current draw from the power transformer and the plate voltage B+ on remaining preamp tubes will increase. The two 50K pots which have their wipers connected by resistors are wired so that as one increases, the other decreases, giving a pan from one point in the circuit to another, probably changing the amount of distortion.
Is there any point in doing a blackface converting of silverface amps? The new schematic confirms my assertion that the old schematic was never updated with the changes they made in the factory. The bias is in fact adjusted continuously according to how much power the tubes are delivering and how much current is flowing from the cathode to ground. Up to the blonde Bassman with blonde colored tolex circuit 6G6 they all had tube rectifier, but since then a diode rectifier was used. It was introduced in 1952 and discontinued in 1983. An essential ingredient is disabling the negative feedback loop make it switchable and convert to cathode bias on the 6L6. To be effective without sacrificing the deep-bass response, the subsonic filter should have a slope or at least 12 dB per octave.
This mod is for those who want more bite and a tone that really cuts through in the mix. All information on this website is supplied free of charge, in good faith and without warranty. Having a fixed bias means, contradictionary perhaps, that you need adjust the bias current or voltage by using a bias pot. We also add a 10K mid pot on the back of the amp described further down in this article. Good for single note and leads.
The Bassman is known for its simple, pure and raw tone. We make every effort to ensure the information contained here is as accurate as possible, but we will not be responsible for any errors or omissions, or anything resulting thereof. These are probably very basic questions and I am slightly embarrassed for asking it. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram. A lot of them on the 1959 are 921 or the 21st week of 1959 and the 1960 has 6004 which is the 4th week of 1960. After reading Guitar Amplifier Overdrive I've decided against recommending an increase in the resistance of the stock 470 ohm screen resistors too due to their affect on screen voltage induced distortion. As for all amps you will be able to shape your tone significantly with selecting speakers and tubes.