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50s yearPeerless (Altec) A-428B preamplifier 600:600ohm * VG+++
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- Manufacturer:
- Altec
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Prestage tube and secondary tube is 12AY7(12AT7). You can change tube to 12AU7, 12AX7 without any change.
Gain is 20db, response frequency is 20~20K Hz.
Power supply is separated with amplifier part. Rectifier tube is 5R4GW, 6SN7 and 12AX7 was used for regulating help sound more analog and clearly.
Original schematic is included.