Definately DIY. You will get the best match for your amp that way.
Get 16 Ohm drivers that imitate the extended range d130 JBLs and the compression horn 075 tweeter with a crossover at 2400 Hz. Put them in a simple bass reflex box without the tuned port and you have a classic match for an EL84 7868 or 7591 output tube integrated.
When using the original 030 driver package in a typical c38 enclosure the efficiency is rated in the mid to high 90s Db/W/M. I own two pairs of such speakers and do solemnly swear they are more efficient than my 104 Db/W/M Vintage Klipsch La Scalas.
You won't be able to buy original JBL or Altec drivers for $200 but there are good much less expensive copys easily available. The 16 Ohm speakers are found in the pro audio section of speaker supply firms.
Look up the originals on the Lansing Heritage JBL website. The models are C38 and C36 also called the Baron and the other I forget but you will see these drivers used in a number of the vintage JBLs that tweeter is the original bullet horn tweeter. The extended range woofers are found as a separate grouping from the driver suppliers.
Unless you buy Boutique SET targeted speakerss you will find it tough getting a pair of 16ohm commercial speakers I don't know any. That tube integrated was intended to be used with 16 or even higher resistance speakers.
