Thanks, Bob, and good morning, everyone. Last quarter we launched the Power & Microwave Technologies Group. As we mentioned, PMT includes our historical EDG business, plus new technology partners for RF, microwave and power and energy markets. We're focused on developing relationships with the key technology partners, but also disruptive technologies in these high-growth markets while taking advantage of our global infrastructure and customer base. This strategy has gained traction in our second quarter for design wins and strong bookings.
Also during the last quarter, we announced agreements with over 8 new suppliers of these key disruptive technologies. This has proven to be successful as design wins and booking rates have increased every month in Q2 and continues into Q3. During the quarter, we book orders for new technologies such as ultra caps, Gallium Nitride and Silicon Carbide, and realized orders resulting from key investments in Electron Device business unit. Even with design cycles in these markets of 6 to 18 months, we're already seeing this design work turn into bookings setting up a strong Q3 and Q4.
The management team at PMT has a proven track record of launching new technologies in this market and the recent investment in field sales resources have resulted in an extremely expanded, highly technical field team that is up and running. This, and our unit global capabilities to support these technologies and our technology partners, with the highest design in capabilities and standards for which Richardson Electronics Limited is known for. We will continue to invest in key growth areas of the world as our line cards and capabilities continue to expand.
In the second quarter, revenue for PMT was down slightly versus prior year. Sales were $25.2 million versus $26.8 million in Q2 FY '15. Gross margins decreased from 31.9% to 29.9%, mainly due to products and geographic sales mix and the impact of exchange rates. However, our book-to-bill 3 months ratio is currently at very strong 1.15.
We had a number of regions that showed strong growth in the quarter, led by our Asia team in China, Korea and Japan. These regions captured market share growth in electron tubes and assemblies. In addition to sales developing from the new rollouts of these new technology suppliers, these gains were offset by a decline in Latin America revenues, again, relating to the challenging market conditions in Brazil and by a slowdown in demand for wafer fabrication equipment in North America, which was a strong market for our engineered solutions group last year. Europe was on par with fiscal year 2015 second quarter revenues. Results on a comparable basis would have been greater, but were negatively impacted by the devaluation of the euro.
Demands for tubes continues to be healthy in several key markets. Revenue in both the industrial and medical markets increased, and we had a strong bookings in avionics and marine market. These increases were offset by rapid declines in the broadcast tube market as patients continue to transition from analog to digital, and slowdown within the semiconductor wafer fabrication market. However, we are focused on expanding our customer base and product offering to offset the peak and valleys inherent in these markets.
We continue to be excited about FY '16 as we gain momentum with the launch of the Power & Microwave Technologies Group. We have a very strong position in electronic tubes and related assemblies with incredible market share.
Demand for product is strong and supplies is strong, and bookings are accelerating already in Q2. With a strong backlog driving us into Q3 and Q4, we are confident that we will finish FY '16 strong and with good momentum going into FY '17. However, there continues to be some red flags out there. The semiconductor wafer fabrication market in North America is still showing a moderate slowdown. As you saw in Q1, Brazil requires an extended recovery plan and fluctuations in foreign currencies versus the dollar continue to create challenges.
However, the customers we address with electronic tubes and assemblies that are hungry for our global support, a new technology strategy require a smart investment and some designing time. But this will allow RELL to maintain its large market share for niche products and niche applications. We will see top line growth as our strong Q2 bookings convert to revenue in Q3 and Q4
With that, I will turn over to Pat Fitzgerald to discuss Richardson Healthcare.