24-07-2019, 01:18 PM
Hi Alan,
I've been reading the whole of this thread with some interest as I have just become the owner of a VM77A.
I haven't seen any mention of this A model in your posts and wonder if its new to you.
From a quick look through the circuits you have posted, they all look the same although I read somewhere there are some slight differences so apart from the obvious difference where one is landscape and one is portrait style, I would be interested to know how the VM77, VM77A and VM77B differ.
My A model has only one cal pot that I can see and it looks like the pot is 50 ohms whereas all the circuits I've seen state 100 ohms.
I downloaded the 77B instruction manual and as you say, there are no pictures or drawing showing the location of the various components.
Is there another manual that gives full servicing info? They appear to be impossible to dismantle to get at the innards so any clues here would be welcome!
Best,
SM4
I've been reading the whole of this thread with some interest as I have just become the owner of a VM77A.
I haven't seen any mention of this A model in your posts and wonder if its new to you.
From a quick look through the circuits you have posted, they all look the same although I read somewhere there are some slight differences so apart from the obvious difference where one is landscape and one is portrait style, I would be interested to know how the VM77, VM77A and VM77B differ.
My A model has only one cal pot that I can see and it looks like the pot is 50 ohms whereas all the circuits I've seen state 100 ohms.
I downloaded the 77B instruction manual and as you say, there are no pictures or drawing showing the location of the various components.
Is there another manual that gives full servicing info? They appear to be impossible to dismantle to get at the innards so any clues here would be welcome!
Best,
SM4
