SDA

More on Watkins Amps

Author: matthew; Published: Nov 12, 2008; Category: Amplifiers; Tags: , ; No Comments

After installing the new power transformers in the Watkinses and replacing bloaty and old electrolytics both combos are sounding great. I plan to get Perry to trace the circuit of each on Friday so I can offer it here for all the internets to see.

Watkins before

Watkins before

KM56, SM69, Watkins Amplifiers

Author: matthew; Published: Nov 10, 2008; Category: Amplifiers, Microphones; Tags: , , , ; 2 Comments

Spent the morning helping set up for the new session. Balanced the Genelec near-field monitor levels to the NS-10s. Oriented the visiting engineer.

Problem – One of the matched KM56 mics and one side of the stereo SM69 have the delightful sounds of cracklin’ potatoes after being on for an hour.

Solution – I left the mics powered up on the bench for more than 24 hours. none of them show any evidence of problems. This is irritating. I applied various stress positions to no avail. The capsules seem to seat properly and the cables seem intact. I do not know what mic cable was used for either microphone when the initial problems presented.

Problem – The newly acquired Watkins amps sound good but are too quiet.

Solution – Upon examination it turns out that both amps are set up to run only on British voltages and when I apply 220 volts both amps sound great. I discussed the situation with the studio manager and she preferred that I change the power transformers in the amps rather than run them from external transformers. I ordered transformers from Weber.