Apologies - I am a newcomer and posted this incorrectly, so it came up on the admin page. Trust this is correct now and the moderator can delete the other post
I purchased a HPG1 signal generator three months ago new from a reputable source to use in the audio range from 10 - 20,000 Hz. When I connect it to my valve (tube) amplifier input, the output is low and the voltage is unstable, cycling through a set of voltages. The amplifier input impedance is probably about one megaohm. The performance is more satisfactory when connected directly to the oscilloscope 50 ohm input.
The build is 1134. I think from an earlier query that this build is several years old.
Please can you tell me:
The current build
Whether you can update the firmware
Whether this will solve the problem