The notes just bloom and decay gorgeously with even moderate attack and it is just a thrill to play. The amp has become an instrument in its own right and I love playing it.
I received the tubes on the following Monday as you promised, and I really appreciate it. This time around I needed to get my Victoria healthy again. Thing just started crapping out on me and making seriously obnoxious noises outside of my typical guitar playing J. Only three tubes, but I did not have time to sort them out — so I just replaced all three tubes with those I purchased from you. I just thought my setup was hosed, but holy cow, what a difference after replacing the tubes.
There is a 3 dimensionality and added clarity to it now that just makes my mouth water. Absolutely wonderful. I suspect I better start really learning about tubes and their impact on tone. It really makes a difference. It sounds better then ever and is dead quiet! No more noise, the clean side is heaven, and the gain side roars! I ordered on a Thursday evening and had them in my amp Monday afternoon. The packaging was superb and gave me complete confidence out of the box!
Needless to say you have one very happy customer. Thank you. These Rubys are very smooth and sweet, per Doung's description, but what really stood out was their bass response. Tighter and deeper, ' nuff said. Listening to LP's is truly an enveloping experience, which is all I could ask for. While the JJ may be a bit cleaner, it is a bit thinner also. The Ruby sounds great! Thanks for a great suggestion and great service! We replaced the three stock tubes and after a 10 minute warmup, my first check was to turn all knobs on 10; the amp had so much more gain that I had to "lower" the preamp control to 0.
I use the "active" preamp selection with all of my basses otherwise this amp distorts too easily and sounds more like a Marshall guitar amp then a traditional bass amp.
Note this amp has a large dynamic headroom 60v p-p using a three tube preamp and a high current solid state watt power amp. Also known as the ECC83 or the , it is a dual triode tube that has the highest voltage gain of all preamp tubes, with a mu of Widely used across guitar amplifiers and hi-fi applications.
New old stock, long plate, square getter, 50's vintage. Stock for major amp makers. Best for those on a budget. Rugged, durable, quiet. Strong output, a budget tube. Doug's Tubes, Inc. JavaScript seem to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Search Search. Today there are no factories in North America making tubes anymore but by request manufacturers will label them as such.
After all, the design is the same. The ECC83 on the other hand is the label that was applied to the tube type by European manufacturers yet it is the same tube. They are the same tube type with just a different nomenclature so go ahead and use that ECC83 in place of a 12AX7! The is a name that was given to an upgraded version of the 12AX7 in the s. The upgraded version was quieter and more robust than the standard 12AX7 of that time. A few years later, manufacturers of the 12AX7 began to make their tubes in the same manner as the Today some manufacturers still claim to make a version of the with better metals for a more robust tube.
The version of the 12AX7 was created as a military spec tube. This tube was given extra support internally and had matched triode sections.
Some people refer to the as being a 12AT7 because it too has a gain factor of But this simply is not the case as the plate resistance of a is the same as a 12AX7. So if you want to tame an amplifier with too much gain, this is the tube you want to use in select spots of a pre amp.
You can also use this tube in the position of the phase inverter to produce less power from an amplifier. You may have come across these two labels in your hunt for tubes and were curious about the differences. They are made in the same batches and are the same tube, but some of them come out producing high gain. For all intent and purpose, the 12AX7-B is simply a screened tube selected for its high gain and low noise. Mesa Boogie and Peavey use 12AX7-A labelled tubes because of the higher gain, but this comes at a price of a noisier tube sometimes.
But if you want a gain monster for an amplifier and are not worried about noise, the 12AX7-A is your animal. One of the common terms used among tube amp owners is microphonic. This is a go to term used when issues with an amp arise. When tubes are manufactured, they are tested for a number of different things to verify they are a good tube. A microphonic tube is a tube that is susceptible to external noise and amplifies it. In most cases the tube will ring like a bell if tapped on.
Now, most tubes will make noise when they are used in the input position. A microphonic tube on the other hand will ring and produce very high frequency noise.
The tube is an electromechanical device that can be damaged if it is hit too hard. In some cases there are little to no tests done by some manufacturers. Most tests are done by amplifier builders to weed out any bad tubes.
Sometimes batches of very microphonic tubes will make their way to an amplifier manufacturer, but this does not mean that microphonic tubes are all bad tubes. Infact, some microphonic tubes have the potential to outlast a less microphonic tube.
The trick with above average microphonic tubes is making sure to prevent using them in a position with a low noise floor. For example, you do not want to use a tube that is microphonic at the input position of a pre-amp or a tube driven effects loop. The noise floor at these positions is very low and the ring of a microphonic tube will be very noticeable here.
It is always better to use a microphonic tube in a position where the signal levels have already been amplified and are larger. If the tube is so microphonic that it is unstable, its best not to use it at all. If its got a slight ring to it but is somewhat stable, it will probably be ok.
There are products on the market that can help with microphonics. Tube dampers can be slipped over the tubes in order to prevent the ring of a microphonic tube. Aramox makes a great damper that can be reused with any tube you install to prevent any noises and are extremely affordable. Have tubes noises you want to get rid of? Try their dampers and see if it solves your tube noise issues. You see, tube noise is actually more of an issue than microphonics. A noisy tube will make crackling noises, hum and even pop occasionally.
Noises that are not appreciated, especially in an amplifier designed for high gain guitar or a Hi-Fi stereo system! Typically a tube will produce a soft hiss or white noise as it is often referred to. This is normal and will be different from tube to tube as some produce more white noise than others. Amplifiers like this have many triode stages connected in series.
Each stage will amplify the white noise of the input stage making it more noticeable. And so using the quietest tube you can find in the input or first stage will always be your best bet. Some amplifier companies like Mesa Boogie take the time to find the quietest tubes within their batches. They then sell them for the first stage or input stage of high gain amplifiers. So if you play with high levels of gain, you are more likely to have a better experience with these quieter tubes.
So what kind of noise does a tube have to make before it should be replaced? Well if your 12AX7 begins to make any pops or crackles, it is probably time to replace it. Now, if the tubes are brand new and you put them in and they crackle. But if you have had the tubes in your amp for years and it starts crackling or popping. While the 12AX7 tubes are designed around certain gain parameters etc. So we have created a comparison chart below with some reviews on what we feel these tube brands bring to the table.
This tube is very well balanced and is relatively low in noise. This tube is warmer sounding than other 12AX7 and is great if your looking for a darker sound. If you have a harsh or bright sound, this tube will tame that harshness.
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