Vortexion bias and erase oscillator - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

peter_sol · 25th Jan 2018, 11:15 am

An ECC81 has a higher Anode current and may be better

BillDWVA · 29th Jan 2018, 7:40 pm

A quick update on this WVB. A replacement 12BH7 valve arrived today and the oscillator is now running nicely with fully adjustable bias.
I’ve cleaned up the paintwork with car body rubbing compound and wax and one final job was to make some new pressure pads which were ‘croutons’ of piano-tuners’ felt glued to the mu-metal wings of the pressure arms. I don’t know how long they’ll last especially as I am guilty of using back-coated tape on my machines...

Thank you for all the helpful advice and contributions. However this is probably not the last Vortexion i’ll be working on as I have enough ‘parts’ under my bench to build another WVA and a WVB

Bill

25th Jan 2018, 11:15 am	#21
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Vortexion bias and erase oscillator An ECC81 has a higher Anode current and may be better

29th Jan 2018, 7:40 pm	#22
BillDWVA Pentode Join Date: Nov 2010 Location: Tenby, Pembrokeshire, Wales, UK. Posts: 139	Re: Vortexion bias and erase oscillator A quick update on this WVB. A replacement 12BH7 valve arrived today and the oscillator is now running nicely with fully adjustable bias. I’ve cleaned up the paintwork with car body rubbing compound and wax and one final job was to make some new pressure pads which were ‘croutons’ of piano-tuners’ felt glued to the mu-metal wings of the pressure arms. I don’t know how long they’ll last especially as I am guilty of using back-coated tape on my machines... Thank you for all the helpful advice and contributions. However this is probably not the last Vortexion i’ll be working on as I have enough ‘parts’ under my bench to build another WVA and a WVB Bill Attached Thumbnails