BV to OP on review of TSOS Vol3-1

Vol 3-1 Letter from Burkhard Vogel to the review of his book by Ovidiu Popa Burkhard Vogel, the author of The Sound of Silence, commented on the review of his book by Ovidiu Popa in Vol 3. Mr. Vogel offers some additional information about applying very-low-noise BJTs in phono preamps.