The 73JR is a true ´73 style mic preamp in a single 500 series slot with some added features that will cover all the recording needs for engineers and musicians that don´t find the need to track with eq.
Employing only discrete circuitry and conventional components, the 73JR is a faithful 3 stage all class A ´73 preamp. Styroflex and tantalum capacitors have been used throughout. No corners were cut.
A useful all discrete class A hi pass filter has been added, essential for recording everything with the exception of probably kick drum and and bass.
The Line mode allows for reamping of prerecorded tracks and it´s perfect for adding some class A color to lifeless recordings.
The smart switched DI (automatically switches from MIC to DI mode when inserting a MONO ¼” jack) is an all discrete class A JFET circuit ahead of the MIC transformer, so all the juice is there. Since its introduction in 2013, it has become a classic DI for bass.
Finally, special care has been taken with power handling, implementing internal +24v slow turn on regulation (about 20 seconds to reach full voltage).This makes your 500 series enclosure´s power supply healthier and makes the 73JR independent of the rest of the slots.
• Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for lo gain ribbon mics. Input is transformer balanced and floating.
• Line input impedance: 10K Ohms bridging, transformer balanced and floating.
• DI input impedance: Greater than 2 Megohms, unbalanced.
• Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 ohms (factory terminated).
• Maximum output: Greater than +26dBu into 600 ohms.
• THD: Less than 0.025% at 1 Khz, less than 0.05% at 100Hz.
• Frequency response: 20Hz ( +0.3dB ) to 20Khz (-0.2dB)
• Maximum gain: Slightly greater than 80dB
• Noise: Less than -100dBu.
• Power consumption: 88 mA per rail @+-16VDC.
Well, I´ve finally gotten around to writing a review for this absolutely stellar preamp… it only took me three years! At least you know that I actually had time to give it some use before writing my review. Since, winning my 73Jr in an online writing contest, it has made valuable contributions to all of my recordings. Everything about the 73Jr is well made and I can’t say enough about its build quality. It´s based on the vintage 1073 preamp and it adds a warm, creamy clarity to vocals and it makes digital keyboards/synthesizers sound less digital before hitting the DAW. My 73Jr does what it is meant to do and it does it flawlessly. BONUS: when pushed it adds some really sweet breakup to clean guitar. I never imagined that a mic preamp could actually contribute to a recording… I mean, all they do is raise the volume of a signal, right? Hahaha! I was wrong and I’m glad I was wrong! Had I not won my 73 Jr in a contest, I would have never found out how truly necessary a good preamp is to making a quality recording. I have to admit that, my first thought was to sell it for some quick cash – I didn’t own a Lunch Box and my prize was going to require the purchase of a Series 500 chassis. But, ha! I’m a gear freak and the 73Jr now sits next to an harmonic exciter and a compressor. I’m glad I spent the money on a Lunch Box because the 73Jr is a keeper!!!! If you are in the market for a 500 Series preamp, the Heritage Audio 73Jr will make you a very happy camper.
It´s a truly special unit. It´s a best in class considering its price, having ahpf, and line in onboard. Without all of those things it still wins, as it´s exactly what you´re looking for sound-wise. I´ve tried several other sub 1k iterations of this circuit. Up until now, nothing has gotten me this close. Shines on vocals, and synths. I´m frantically trying to save to get another unit, and will eventually add the eq’s as well. This is the real deal folks. My Sweetwater Rep, Brian Loney was dead-on with this one!
It’s the real deal… been tracking vocals on this thing with an SM7b and Warm Audio 1176 after in the chain before printing in Protools… excellent. Just recently tracked a kick drum with it and it was surprising very transient and punchy accompanied with API 550A/560 EQ within the Protools DAW. Incredible piece that is a MUST in your U-rack.
I’m completely loving this preamp after a couple of weeks of ownership. Dialing in a good sound is straightforward. I have gotten thickly saturated sounds from a DI improving tone on my Fender P bass and allowing the bass to be heard easily in a mix. Playback on my iPhone speakers still produced the clear sound of the bass recordings. With a cheap mic I was able to dial in a clean sound by keeping the input transformer subdued and cranking the squeaky clean output transformer. By the way, the pad is in the chain before the input transformer so engaged you can crank the input harder. Also lots of success with my Alpha Juno 2 analog synth. It sounds huge. I will likely invest in the 73eq down the line. Tone galore.
Can´t go wrong with this Pre. The amount of tonal variation the gain knob provides will make it easy to fit any source you throw at it. Great on Vocals – just sounds simply expensive. I usually record guitars direct and this thing gave my Axe Fx 2 a new life. ( Never thought the sound of the Axe fx needed any more but this preamp just gives the sound an extra level of clarity ) Can’t wait to get at least another one of these units for a stereo pair.