Difference between Rowe 60993101 and 60993102 amps?

Perhaps a bit contemporary, but had to have one 'modern' example in the collection... <g>

The header pretty much sums it up...

I've got a Rowe R94 (aka RoweStar) combo jukebox that I really want to put the CD player back in, but it's got the wrong amp in it. (really wrong, like out of a R87)

Been hunting around for amps at reasonable prices, and the book indicates that the 'proper' amp for the combo configuration is the 6-009931-02 but those seem somewhat elusive where the 6-009931-01 variants pop up with a fair bit of regularity.

So... does anyone know exactly what the difference between the two is? I would suspect the configuration of the 'mute' circuit, but that is just a wild guess.

And following on to that, if one has the -01 variant, how difficult would it be to mod to the -02 configuration?

And yes... I can hear folks saying "just grab the schematics and figure it out your own fool self!", but if someone has already worked it out... Never hurts to ask, eh?
And I'm trying to decide if it's just tome to nab an -01 variant and start tinkering with it or just keep looking for the -02.

And yes... (2) you may correctly infer from that I am looking for the appropriate CD deck as well... B}

Thanks;
-jim

Jim,
I am not 100% sure of this but most Rowe part numbers are only 6 digits long. The last two are the "Rev #"
99 % of the time, if the part number is the same, it will interchange without any problems, with a different Rev #.
As for the schematics for that amp--grab em, if you can find them--doubt both revs are shown--
Ron Rich

Thanks for the note, pretty much understood that the last two digits were a 'revision' number (especially seeing as they are expressed as "6-09931-01" on the physical unit)
but what concerns me is that the Rowe manual specifically calls out the 6-09931-01 amp for the R-94 and the 6-09931-02 amp for the 'Combo' variant. There are no 'notes'
or other explanation in the docs, hence the search for some additional insight.

And then, just to add to the amusement... The schematics in the manual does not even call out the amplifier as a unit, but rather as separate sections (preamp, driver, etc.)
so I can't even tell which variant of the amplifier I have the schematic for (since I do not have the amp).

Guess maybe it's time to just give in and pick up a -01 amp and then see what type of weirdness (if any) occurs when I track down a CD deck for it and get it installed.

-jim

Hi Jim,
They stopped using the "dashes" in Rowe part numbers about the time they changed to CD machines--I heard that they purchased new computers, that could not handle the dashes----
It MAY be, that they added an input jack-- for the CD player to the -2 amp ? If that's the case, you may, or may not, be able to use the earlier one ? Ron Rich

Jim, Ron I finally a schematics for one of the R91-92 Combos I once had.

The CD input comes in right after the RIAA preamp through an "L" pad of two resistors: A 100K in series with CD input divides by a 68K to ground.. The muting is handled by the central computer so is the same for either.

I'll scan them if you want.

Rob/NYC

Edit: Check the muting remark. There is another thyristor added in parallel to the one controlling the mute relay, it appears to be associated with a microphone input.

However the main muting circuit gets closed by both input from the record mech as well as from the comp in cd operation.

it appears that two muting input triggers simply ground one side of the coil to mute and they are both in parallel so it looks like you would just add a wire to Pin 13 on connector J3 to allow CD muting if not already there.

So as to not leave this one flapping in the breeze...

Managed to borrow a 6-09931-01 amp for a bit and dropped it into my R-94 since in the interim I had procured a proper
CD changer for it and really wanted to find out what would happen.

Connect it all up, hit the power, and... No smoke! A good sign.

Records: OK CDs: OK

Sound is good from both sources, and are even reasonably similar in volume (yes, the CD deck did come with the little
attenuator board), and even the muting function appears to behave as expected.

So... unless something happens to suggest otherwise, I think that I am going to hunt down a -01 amp
that I can keep. Since for whatever reason that model seems to show up much more regularly and at a MUCH lower price
than the -02, and proceed happily along.

Thanks to all!
-jim

I don't know the exact difference but a rule-of-thumb with ROWE... you can use a higher #, but not lower... I have seen more problems arise when some one put an older amp in a newer box. It usually kills the mute circuit in the CCC.... Since you tried the 01 already... it's probably ok.(In this case older is a 125 watt, newer is a 130 watt amp.) FYI the attenuator board is because the CD output is 2 volts and the record cartridge is about a half. It was also recomended to use a new CD cartridge and clean the CD hole out.