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The search returned 2 articles:
January 2020:
Project: A low-voltage valve audio preamp
by John Clarke, kits: Altronics kit K5192 (discontinued), PCBs: SC 01112191
[print issue]
[online issue]
January 2020:
Project: A low-voltage valve audio preamp
by John Clarke, kits: Altronics kit K5192 (discontinued), PCBs: SC 01112191,
3 shop items
[print issue]
[online issue]