Industry Lab grade, Lambda Model 28 Regulated tube power supply. Rated Max 300Vdc (adjustable) 100mA and 6.3 Vac 5A. Just serviced and tested. Tubes checked. All wires checked, and re-sleeved or replaced as required. All resistors checked and replaced as required. Circuit mods to lower noise from >5mV to uV range. CLC caps replaced: First cap increased to 10uF oil (was 4uF) and cap after L increased to 75uf (2 x 150uF HF electrolytics) and bypassed with ploypro. Output cap replaced with SCR 30uF polypro (was 2uf). Multi component chassis ground decoupling circuit added with ability to connect or dis-connect from HV -DC (original output floated from chassis ground). 6.3Vac output converted to DC with 25A bridge rectifier and 10KuF cap (you add dropping resistor and cap to reduce to 6.3Vdc per your circuit amp need). This is a great vintage lab grade regulated tube power supply from a highly respected company and highly sought after. Would make a great regulated tube power supply for a tube preamp. Asking $200 plus ground shipping (unit is heavy). Willing to consider any reasonable offer.
| 
