I am intrigued by the changes to the RIAA equalisation circuit in the newer circuit. In particular, I see that the "bass trim resistor" (660K in the latest version I had seen before that) in parallel with the double R-C network has gone. I wonder how that has affected the frequency response.
Alex
Alex,
I had the same question and Thomas from Vacuumstate told me that the new circuit is accurate enough even without the use of a bass end trim resistor. He also mentioned that already in the old circuit the 660k resistor normally could be omited as shown in the RTP3C schematic given on the Vacuumstate website.
airtangent
I had the same question and Thomas from Vacuumstate told me that the new circuit is accurate enough even without the use of a bass end trim resistor. He also mentioned that already in the old circuit the 660k resistor normally could be omited as shown in the RTP3C schematic given on the Vacuumstate website.
airtangent
Last edited:
That's really useful to know - thanks. I'll have to try taking the resistors out!
Alex
RTP3 CD Rom for parts list and PCBs?
Hello everybody,
I am quite new to the forum and would appreciate any hints / feedback concerning the following issue:
I would like to start building the RTP3 , however I am trying to find a "start-jump" way to doing it, concretely, I am trying to find a parts list and the pcbs.
I emailed Vacuum State for the "CD Rom" Allen Wright mentioned here in the forum more than once but didn't ge any feedack.
I would be also interested to purchase the CD Rom from one of the forums memebers here, so any offers would be highly appreciated.
Many thanks in advance,
AdrIan
Hello everybody,
I am quite new to the forum and would appreciate any hints / feedback concerning the following issue:
I would like to start building the RTP3 , however I am trying to find a "start-jump" way to doing it, concretely, I am trying to find a parts list and the pcbs.
I emailed Vacuum State for the "CD Rom" Allen Wright mentioned here in the forum more than once but didn't ge any feedack.
I would be also interested to purchase the CD Rom from one of the forums memebers here, so any offers would be highly appreciated.
Many thanks in advance,
AdrIan
Hi Adrian.
Sorry, I can't help regarding the CD.
Just a point though regarding PCB's, (and I will stand corrected with this if I'm wrong) but I was under the impression that only the very early versions were on PCB. I believe subsequent production, and the preferred option, was point to point wiring.
I've PM'd you.
Hello Valve5425,
direct wiring is the preferred way. But there are PCBs in the game : SuperReg, Powersupply of RTP3D.
Btw. the very latest units come fully on PCB as you can see on this picture: http://sixmoons.com/audioreviews/vacuumstate/8.jpg
best, tom
direct wiring is the preferred way. But there are PCBs in the game : SuperReg, Powersupply of RTP3D.
Btw. the very latest units come fully on PCB as you can see on this picture: http://sixmoons.com/audioreviews/vacuumstate/8.jpg
best, tom
AFAIK, the CD is only provided for those that bought kits from Vacuum State. As such to sell a copy would be copyright infringement.
Re Tom's PCB comment, the RTP kits use unetched PCB like material for mounting everything but are still P-P. The commercail FTP uses a PCB, Allen's comment was that they get 90% of the performance of P-P with 50% of the cost.
dave
Re Tom's PCB comment, the RTP kits use unetched PCB like material for mounting everything but are still P-P. The commercail FTP uses a PCB, Allen's comment was that they get 90% of the performance of P-P with 50% of the cost.
dave
