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Old 7th February 2016, 10:27 AM   #1
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Default Info Jeff Rowland & Rowland Research model 7

Good morning, I would like information about jeff rowland.
I would have the opportunity 'to buy 2 mono jeff rowland golden / black
but 'I want to know what difference exists between the Jeff Rowland and Rowland research model 7. what are the concerns of those objects JR / RR
I've always liked but I'm afraid being a bit 'old age'
I currently am satisfied with my setup and my sound I have a pair of natural well-sounding speakers and very linear and consistent Triangle Magellan SW2 with preamplifier Spectral DMC 30 ss and mono amplifiers in class A Pass Labs xa 160.5.
and just the model 7 take the place of XA 160.5 Pass.
thank you very much for your advice about.
Gustavo Naples Italy
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Old 7th February 2016, 12:28 PM   #2
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What is the question ?
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Old 7th February 2016, 01:25 PM   #3
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MY QUESTION AND 'THE FOLLOWING;
I WOULD LIKE TO BUY THE MODEL 7 JEFF ROWLAND AND PRE CHOERENCE THEN THESE SHOULD BE TO REPLACE MY CURRENT PASS XA 160.5, AND I WOULD LIKE TO KNOW 1, WHAT CHANGES BY JEFF ROWLAND A RESEARCH ALWAYS ROWLAND MODEL 7, E 2, THEN WHAT I HAVE SEEN worry L 'ETA' WHO.

THANK YOU FOR YOUR VALUABLE ADVICE
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Old 8th February 2016, 08:54 AM   #4
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hi, just no one can 'give me some more' specific information ???
thank you
Gustav
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Old 8th February 2016, 09:12 AM   #5
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Gustava,

scusa mi, ma, voi non parlate bene l'Inglese.
Per favore, in Italiano, qual e il tuo problema/domanda ?
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Old 8th February 2016, 12:01 PM   #6
iperv is offline iperv  Italy
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I think Gustavo would like to know if Jeff Rowland Model 7 is the same as the Rowland Research Model 7.
He's going to buy one of them to substitute his actual pass amplifier.
He's also afraid that they could be too much aged.

He needs some info.
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Old 8th February 2016, 02:24 PM   #7
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Ah, then you could tell Gustavo that Mr. Rowland changed the name of the company from Rowland Research to JRDG in the early 90s.

The Model 7 was manufactured both as a RR and a JR(dg) product.
Officially there are 3 versions of the Model 7 : Series I, II and III.
(there apparently was also a Series-O, or a pre-production model, there's a thread on those at this forum)
1990 manufacture was still Series II, the Model 9 of 1992 was only manufactured as a JRDG power amp.

There's not been a Series IV.
Circuitry of a JRDG Model 7 is basically the same as a Series III Rowland Research.
Cosmetics of both differ, rear panel + inside, but Mr. Rowland has made a habit of making small changes without upping the Mark/Series a point.

(I'd keep the 160.5 if I were him. Sorry for the Gustava typo)
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Old 8th February 2016, 02:29 PM   #8
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ok thanks for your info
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Old 8th February 2016, 03:10 PM   #9
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Series I was manufactured from 1986
Series II is from around 1988/1989
Series III is past 1990 till 1997

Serial number 7500 still is RR.
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Last edited by jacco vermeulen; 8th February 2016 at 03:12 PM.
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Old 8th February 2016, 03:45 PM   #10
dadod is offline dadod  Croatia
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Quote:
Originally Posted by jacco vermeulen View Post
Gustava,

scusa mi, ma, voi non parlate bene l'Inglese.
Per favore, in Italiano, qual e il tuo problema/domanda ?
Oh mio Dio, Lei parla Italiano tanto bene!
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