The year has been a good one so far for New York's Harvey Electronics and for national electronics retailer the Tweeter Group. The news isn't so rosy for West Coast chain the Good Guys.On July 19, Harvey Electronics, Inc. announced increased sales for the month ended June 23, 2001 and for the previous eight months. For the month, net sales amounted to $2.6 million, a 15.7% increase over the same month last year. For the eight months ended June 23, net sales totaled $26 million, an increase of approximately $5 million, or 12.8%, over the same period last year. Comparable store sales for…