UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Heatercathodeshort · 12th Sep 2011, 6:34 pm

The visconol is only fitted when uncoated tubes are employed. Some versions were fitted with CRM143/CRM171 tubes that required the evil capacitor. Your version has a coated tube and will not require one. Metrosils never go S/C as they are a passive component. I think a new U25 and a twiddle on the ion trap will produce 'first light'.
The ion trap adjustment is not so critical with Mazda tubes as it is with Mullard. Count down to ecstatic enjoyment is not far away..

12th Sep 2011, 6:34 pm	#95
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Restorers dream part 2 the chassis. The visconol is only fitted when uncoated tubes are employed. Some versions were fitted with CRM143/CRM171 tubes that required the evil capacitor. Your version has a coated tube and will not require one. Metrosils never go S/C as they are a passive component. I think a new U25 and a twiddle on the ion trap will produce 'first light'. The ion trap adjustment is not so critical with Mazda tubes as it is with Mullard. Count down to ecstatic enjoyment is not far away..