UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Vector Research VCX-250 cassette deck: Volume difference playback vs. recording

knobtwiddler · 28th Jan 2023, 5:03 pm

Tim is likely right. The input on the amp appears to be loading the o/p of the deck too much.

i) Does the deck manual say anything about connecting it to an amp with high-ish input impedance? It's not uncommon to see manuals for 70s gear requesting termination into a load that's at least 50KR. Some gear used minimal buffering, with just a single transistor - and it won't like driving below 50K.

ii) What amp is it driving, and what input are you using? If the deck is as detailed above, but the amp is, say, 10K input impedance, you might lose a good few dB in level.

28th Jan 2023, 5:03 pm	#17
knobtwiddler Octode Join Date: Mar 2016 Location: London, UK. Posts: 1,047	Re: Vector Research VCX-250 cassette deck: Volume difference playback vs. recording Tim is likely right. The input on the amp appears to be loading the o/p of the deck too much. i) Does the deck manual say anything about connecting it to an amp with high-ish input impedance? It's not uncommon to see manuals for 70s gear requesting termination into a load that's at least 50KR. Some gear used minimal buffering, with just a single transistor - and it won't like driving below 50K. ii) What amp is it driving, and what input are you using? If the deck is as detailed above, but the amp is, say, 10K input impedance, you might lose a good few dB in level.