RA66 re-amping box transformer & line-input transformer for vacuum tube input.
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$79.00
$79.00 - $529.00
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Description
The RA66 differs from other re-amping box transformers in several ways. The most significant difference is the impedance ratio, which is ideally chosen for the RA66 to provide excellent bandwidth without the extremely high output volume often associated with the transformers commonly used for this application. That is not to say there is no need for a volume pot. You'll still want to slap a 100k Ohms logarithmic potentiometer across the output and send the wiper to your 1/4" output jack. There will be some volume boost that occurs due to the impedance ratio of 6k:60k. Connect your XLR input jack to the 6k Ohms primary and the secondary 60k output goes to the volume pot and output jack. Put it in a box and you have a passive re-amping box with transformer tone. You could also put a buffer stage on the output if you want to get a more transparent tone.
The RA66 differs from other re-amping box transformers in several ways. The most significant difference is the impedance ratio, which is ideally chosen for the RA66 to provide excellent bandwidth without the extremely high output volume often plaguing the transformers commonly used for this application. That is not to say there is no need for a volume pot. You'll still want to slap a 100k Ohms logarithmic potentiometer across the output and send the wiper to your 1/4" output jack. There will be some volume boost that occurs due to the impedance ratio of 6k:60k. Connect your XLR input jack to the 6k Ohms primary and the secondary 60k output goes to the volume pot and output jack. Put it in a box and you have a passive re-amping box with transformer tone. You could also put a buffer stage on the output if you want to get a more transparent tone, which is what I did with my active 500-series "Eye of Jupiter". It just so happens that same impedance ratio works excellently as a line input transformer for a vacuum tube input. That's exactly what I'm using the RA66 for in my upcoming "Sun Storm compressor".
This transformer is currently used in the active 500-series "Eye of Jupiter" and as line-input transformers in the upcoming "Sun Storm compressor" from Lightning Boy Audio.
There is a 30-day money-back guarantee on LBA transformers as long as they have not been soldered into a circuit. If your transformer arrives in non-functioning condition, or if you don't like any aspect of the transformers tone or function, or if you just changed your mind, you can return the transformer(s) for a full refund. Refunds are not accepted for transformers that have been soldered into a circuit because it's very possible the end-user may have unknowingly damaged the transformer. It is important to test the transformers prior to install so you can confirm the transformer is not at fault prior to installation. It is also important to prevent over-heating the pins when soldering. For testing purposes, the primary DC Ohms (DCR) should measure roughly 590 Ohms. The secondary should measure roughly 3.12k Ohms. There should be close to 0 Ohms between pin 7 and the shielding can. Neither the primary nor secondary should have any connection to the shielding can. When soldering I personally keep my iron set to somewhere between 530-560 degrees Fahrenheit with the lead-free solder I use. My dwell time on the pins is roughly 2 seconds. If you spend much more time than about 3 seconds at that temperature, you risk damaging the internal solder connection to the pin. That is not repairable. If you need to touch up your solder joints, be sure to first let the pins completely cool. We have a prototyping circuit board available here if you need a way to mount the transformer in your enclosure.
The dot on the top of the shielding can is directly over pin 1 (of 8) on the bottom side. The dot indicates pin 1. Looking at the top side of the transformer, the pins are oriented beneath in a counter-clockwise rotation from 1-8, with 1 being the pin directly in line with the black dot. You can see from images below which pins are used in this transformer and what each of them represents.
We are providing helpful tools for implementing LBA Magnetics into designs made with KiCad. If you're a circuit designer or tinkerer using KiCad, download the RA66 footprint, schematic symbol, and 3D model right here:
This transformer is currently used in the active 500-series "Eye of Jupiter" and as line-input transformers in the upcoming "Sun Storm compressor" from Lightning Boy Audio.
There is a 30-day money-back guarantee on LBA transformers as long as they have not been soldered into a circuit. If your transformer arrives in non-functioning condition, or if you don't like any aspect of the transformers tone or function, or if you just changed your mind, you can return the transformer(s) for a full refund. Refunds are not accepted for transformers that have been soldered into a circuit because it's very possible the end-user may have unknowingly damaged the transformer. It is important to test the transformers prior to install so you can confirm the transformer is not at fault prior to installation. It is also important to prevent over-heating the pins when soldering. For testing purposes, the primary DC Ohms (DCR) should measure roughly 590 Ohms. The secondary should measure roughly 3.12k Ohms. There should be close to 0 Ohms between pin 7 and the shielding can. Neither the primary nor secondary should have any connection to the shielding can. When soldering I personally keep my iron set to somewhere between 530-560 degrees Fahrenheit with the lead-free solder I use. My dwell time on the pins is roughly 2 seconds. If you spend much more time than about 3 seconds at that temperature, you risk damaging the internal solder connection to the pin. That is not repairable. If you need to touch up your solder joints, be sure to first let the pins completely cool. We have a prototyping circuit board available here if you need a way to mount the transformer in your enclosure.
The dot on the top of the shielding can is directly over pin 1 (of 8) on the bottom side. The dot indicates pin 1. Looking at the top side of the transformer, the pins are oriented beneath in a counter-clockwise rotation from 1-8, with 1 being the pin directly in line with the black dot. You can see from images below which pins are used in this transformer and what each of them represents.
We are providing helpful tools for implementing LBA Magnetics into designs made with KiCad. If you're a circuit designer or tinkerer using KiCad, download the RA66 footprint, schematic symbol, and 3D model right here:
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