Greetings, dear friends!
I became the owner of a Jeff Rowland Capri S preamplifier. As I know, this preamplifier had an option - a built-in phono stage, which was placed on two boards and inserted into the preamplifier. And somewhere I saw information that these phono amplifier boards can be made by yourself, and there was even a circuit board on the site.
I did not find such a scheme on the site. I wrote to the contacts listed on the site, and did not receive an answer either.
I decided to write to you, you always help me out, for which I am immensely grateful to you.
Maybe this time I will be lucky and someone will have this scheme, or a finished product? 🙂
I look forward to hearing from you.
I became the owner of a Jeff Rowland Capri S preamplifier. As I know, this preamplifier had an option - a built-in phono stage, which was placed on two boards and inserted into the preamplifier. And somewhere I saw information that these phono amplifier boards can be made by yourself, and there was even a circuit board on the site.
I did not find such a scheme on the site. I wrote to the contacts listed on the site, and did not receive an answer either.
I decided to write to you, you always help me out, for which I am immensely grateful to you.
Maybe this time I will be lucky and someone will have this scheme, or a finished product? 🙂
I look forward to hearing from you.
Friends! I have joy! 🙂 The long-awaited Jeff Rowland Capri S preamp has finally arrived.
I opened it, but did not find a phono stage, but I know that this preamplifier may be with a phono stage. And I know that the manufacturer of this preamp produced separate boards with a phono stage for this amplifier. Does anyone of you have a phono stage circuit for this amp? I will be very grateful for your help!
I opened it, but did not find a phono stage, but I know that this preamplifier may be with a phono stage. And I know that the manufacturer of this preamp produced separate boards with a phono stage for this amplifier. Does anyone of you have a phono stage circuit for this amp? I will be very grateful for your help!
Congratulations! You already own the only part worth having: the beautiful empty case.
Whatever you fit inside is likely to improve upon the original phono boards. Just need to figure out the pinout of the header and then design a simple opamp riaa that can fit the limited space. That's the easy part. Improving the ps switcher will be the real task. Perhaps cloning the JR Supercap board, or getting rid of the switcher altogether is essential before adding phono. All imho only of course 🙂
Whatever you fit inside is likely to improve upon the original phono boards. Just need to figure out the pinout of the header and then design a simple opamp riaa that can fit the limited space. That's the easy part. Improving the ps switcher will be the real task. Perhaps cloning the JR Supercap board, or getting rid of the switcher altogether is essential before adding phono. All imho only of course 🙂
No, this is not an empty case. 🙂 This is a very good digital preamplifier, moreover, I compare it head-on with the tube preamplifier I have, and the sound is almost indistinguishable, it sounds very good. In general, I have a phono stage in a tube preamp, but for some reason I feel like I won't regret making a phono stage in Jeff Rowland as well. 🙂
The fact is that someone wrote on this forum, or on Audiogon that this preamplifier was in two versions, and even the manufacturer produced separate boards for the phono stage.
The fact is that someone wrote on this forum, or on Audiogon that this preamplifier was in two versions, and even the manufacturer produced separate boards for the phono stage.
Yes, there are two boards. There are enough pictures on the net to recreate the boards fully. Nothing special: an INA163 into an OPA2134; passive or hybrid riaa between the two halves of the OPA (unless there is a servo), ceramic riaa capacitors (!), lack of local regulation, lack of any meaningful bypassing capacitance on board. The "luxury" version seems identical, only with a Lundahl 9226 added.
It's a simple diy project to recreate this. Perhaps an hour or two drawing the circuit and another hour drawing the board. Just invest the time and effort and you will be rewarded with a modest and unpretentious set of phono boards that will be impossible to distinguish from the original. If you get stuck with the capacitor values or need reassurance the drawn circuit is correct someone here will likely help you.
It's a simple diy project to recreate this. Perhaps an hour or two drawing the circuit and another hour drawing the board. Just invest the time and effort and you will be rewarded with a modest and unpretentious set of phono boards that will be impossible to distinguish from the original. If you get stuck with the capacitor values or need reassurance the drawn circuit is correct someone here will likely help you.
Thank you! You once again confirmed my data, a separate phono stage module still exists! 🙂
However, the problem is that I have an S series, and on the net I only found a photo of a regular phono stage for the previous Capri series. Here is a link to this module:
https://www.hifi-advice.com/blog/jeff-rowland-capri-continuum-mmmc-phono-modules/
However, the problem is that I have an S series, and on the net I only found a photo of a regular phono stage for the previous Capri series. Here is a link to this module:
https://www.hifi-advice.com/blog/jeff-rowland-capri-continuum-mmmc-phono-modules/