UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - ECC81 with broken glass envelope meets 2 x LND150 transistors

dougietamson · 29th Mar 2023, 2:58 pm

I have a broken Mullard ECC81 valve where the glass envelope had split neatly around where the bottom mica plate was supposed to be.
I un-clipped the the internals down to the copper wires, tinned them and soldered in a couple of LND150 high voltage N-Channel depletion mode transistors, £1.10 each.

It's now a solid state FrankenECC83

Currently only sellotaped together, any suggestions for glue?

Here it is in the phase inverter socket of my JCA22H amp.
https://www.youtube.com/watch?v=VohL5NQni2I

29th Mar 2023, 2:58 pm	#1
dougietamson Hexode Join Date: Mar 2019 Location: Edinburgh, Scotland, UK. Posts: 350	ECC81 with broken glass envelope meets 2 x LND150 transistors I have a broken Mullard ECC81 valve where the glass envelope had split neatly around where the bottom mica plate was supposed to be. I un-clipped the the internals down to the copper wires, tinned them and soldered in a couple of LND150 high voltage N-Channel depletion mode transistors, £1.10 each. It's now a solid state FrankenECC83 Currently only sellotaped together, any suggestions for glue? Here it is in the phase inverter socket of my JCA22H amp. https://www.youtube.com/watch?v=VohL5NQni2I Attached Thumbnails