I would guess the preamp, $100 max., the amp, $200 max. Perhaps someone with Blue Book prices will answer this thread. Or, you can call your local audio retailer, who can look these up. Keep in mind that there are 3 tiers of prices: Retail Used, Wholesale Mint, Wholesale Average. Most likely, you will get Wholesale Mint, maybe a little more. Of course, depending on condition.
They were cute pieces, and I'm even tempted to buy them from you, from they probably don't sound that great compared to today's stuff.
They were cute pieces, and I'm even tempted to buy them from you, from they probably don't sound that great compared to today's stuff.