I have a model 1077B that needs test cables. I called B&K directly and they had no idea for something that old. The TL 5A they make is 4 mil, but that seems too small? The manual references replacement parts but not the jack size that I can see. Thanks

Normal banana plugs are about 4 millimeters (not mills). I believe that they are used for the connections other than the ones that use BNC connectors, or perhaps microphone connectors on the older models.

http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=banana+plugs&rh=i%3Aaps%2Ck%3Abanana+plugs

jr

tl5a cable:

https://www.google.com/search?q=b%26k+tl5+cable&client=safari&hl=en-us&prmd=sinv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjlgJjN6oTNAhVNx2MKHRrmDsIQ_AUICCgC&biw=768&bih=960#hl=en-us&tbm=isch&q=b%26k+tl5a+cable&imgrc=4siHuovwFJ_7HM%3A

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I just use banana plugs with clip leads on the ends and BNC scope probes for the RF on mine.