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Leon Crampin · 13th Feb 2020, 7:25 pm

The difference in the 25V supply between tracks 1 and 2 is normal. There is a giant relay near the ECC81 which reverses the motor and also carries multiple springsets to effect the track changeover. It's energised on track 2 and the coil current lowers the supply voltage a bit. Your voltage readings look to be about right.

Leon.

13th Feb 2020, 7:25 pm	#144
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,870	Re: Grundig TK 819 Any Useful Info The difference in the 25V supply between tracks 1 and 2 is normal. There is a giant relay near the ECC81 which reverses the motor and also carries multiple springsets to effect the track changeover. It's energised on track 2 and the coil current lowers the supply voltage a bit. Your voltage readings look to be about right. Leon.