Gain matching- newer gear to older gear...

J!m

Veteran and General Yakker
Joined
Dec 24, 2019
Messages
9,254
Location
Connecticut
Tagline
BOT
#1
A little side diversion.

I thought about the use of "modern" equipment, such as a CD player, with "vintage" equipment, such as a 70's era receiver.

The receiver wants an input of 150mV and newer stuff has an output of 2v or so (some have variable output, which can be tuned in by ear)

Anyway, I found a calculator to work it out.

Basically, it's a couple resistors between two female RCAs for each channel, and then a male-male RCA adapter.

+input goes to "R1" input; R1 output goes to the input of "R2" and also to the +output.

-input goes to the other side of R2 and continues on to - output.

The calculator indicated R1 value of 1230 ohm and R2 value of 100 ohm.

SMD 0.1% Vishay metal film resistors:

R1 P/N PTN1206E1231BST1
R2 P/N PTN1206E1000BBT1

The 1230 ohm is backordered forever it seems, so I'm not making these afterall. Figured I'd pass this along, since there may be some others here interested, and when I loose my notes, I can look here.

The RCA adapters are like $6 each at Mouser; probably less elsewhere...
 

Lazarus Short

Veteran and General Yakker
Joined
Mar 10, 2012
Messages
14,293
Location
Independence, MO
Tagline
I'm the Red Knight, by grant of the Black
#2
My Yamaha DSP-A2070 had a control for trim, so you could match inputs. It may not be the same thing as you are describing...
 

J!m

Veteran and General Yakker
Joined
Dec 24, 2019
Messages
9,254
Location
Connecticut
Tagline
BOT
#3
I think it probably is.

Many 80's vintage Sony CD players, above a certain price point, had "fixed" and "variable" outputs, for this reason I believe. So when you switch from FM on your receiver to CD, you don't get blasted out of the room...
 
Top