neilt

I was able to speak to the creator of the SB-900 wiring diagrams I mentioned and he has kindly given me diagrams and these permalinks: http://static.jdel.org/sb900_original.png & http://static.jdel.org/sb900_custom.png

ORIGINAL ARIA PRO II SB-900 CIRCUIT:

CUSTOM CIRCUIT WITH SINGLE VOLUME AND VARITONE:

Apols for the bump, but was a new home for the SB information ever found? 

I appreciate, it's a chunk of work to upload and maintain, but it would be great to be able to enjoy the photos and wiring diagrams, alas no longer visible here: https://web.archive.org/web/20120715041653/http://www.prog.rockers.co.uk:80/aria.htm 

(I'm looking for the SB-900 wiring diagram 🤓 )

 

Here's my new Aria Pro II SB-900 (May 1980). The previous owner warned me that the tone knob does very little (it's V/V/T even if the 1980 catalogue specs state otherwise, the knob and switch count match the catalogue photo at least).

Further testing reveals that the output isn't great (but not terrible) on either pickup and there's a fair bit of hum and hiss. My 1983 Aria Pro II CSB-380 with a single MB-IV seems to have double the output and is not as noisy.

So, it looks like it's pickup replacement time, though I will get this double checked by my local bass-maker. The 1979 & 1980 SB-900's appear to have had MB-I pickups and from 1981 onwards MB-II's.

So, question is, do I ask Veijo at: https://www.rautiaguitars.net/aria-pro-ii.html for a couple of MB-IE's to stay close to the original MB-I's or do I put in a pair of MB-II's (as the SB-900's had, post-1981).

I'm guessing the more pole pieces (MB-IE) the better for a passive bass like the SB-900? http://www.projectguitar.com/forums/topic/47441-aria-pro-ii-rsb-600-restoration/

Found this commentary here. Rautia's MB-IE's come with a 4 wire option though:
 

Quote

 

"I would beg to differ slightly in that they certainly do not all sound the same. The first incarnation of the SB-700 ("batwing") is essentially a passive SB-1000, both with an MB-1 pickup which is a humbucker consisting of two bobbins with eight equidistant steel poles each and one ceramic bar mag per bobbin.

Later when the "open book" headstock was introduced the SB-700 was fitted with an MB-II pickup instead, which is the same pickup(s) found in the SB BnG-x/Rx0/Elite-x. This is the same internal architecture as the MB-1 but with AlNiCo poles fitted in a "P-bass" style sensing pattern leaving half the positions in the bobbins empty. I actually prefer the MB-II to the MB-1/1E because of the P-bassy kind of sound.

The newer SB-1000 was fitted with an MB-1E pickup which was identical to the MB-1 but with marginally altered internal wiring changing the configuration options. Sorry, not changing....removing...."

 

https://www.basschat.co.uk/topic/255626-aria-sb1000-noisekiller-circuit/?page=2