John Hardy 990 Op amp

[argonrepublic]

I have a friend who is trying to sell me a bunch of electronic components. In the pile is a John Hardy Op amp. I am totally unsure what to pay for it. I have checked the web and was unable to find anything. Could someone suggest a fair price for the Op amp?

[gary s]

990 Discrete Operational Amplifier:

990 Discrete Operational Amplifier and accessories.

1-24 25-99 100-999 1000-Up
990 (specify 12V, 15V, 18V, or 24V) $46.95 $43.95 $41.95 $39.95
990A (specify 12V, 15V, 18V, or 24V) $47.95 $44.95 $42.95 $40.95
990C $49.95 $46.95 $44.95 $42.95
Socket For .040"D Pin (6 required per 990) $0.89 $0.79 $0.75 $0.69
Output Isolator $4.65 $3.70 $3.25 $2.95
FB-2 (bag of 100) $6.00



10k/500 or 1k/1k Reverse Audio Pot $25.00

[argonrepublic]

So this 990 will make a dramatic difference if i were building a microphone preamp?

[argonrepublic]

BTW: Thanks for pricing

[a.wayne]

Has anyone here used these op-amps before ?

The John Hardy Company 990 Discrete Op-Amp

[argonrepublic]

Ha ha. I posted this months ago. Found myself the last few days mulling over it again. The John Hardy 990 were originally a Jensen part. Not sure what you are using it for but the 990s are apparently unbeatable. There are some quad eight AM-10 amp cards on ebay for $100 or best offer. I was tempted but then decided to go for the 990. I am building I mic preamp. Some say that a mic preamp is inferior if it doesn't have 990 opamps.
You can go to Jensen-transformer website to see them in a circuit. Click on schematics. Please share your findings. I am beginning my 990 project this week.