Jolida 502B Response Audio Signature-Modified Tube Amplifier

Response audio signature-modified Jolida 502B integrated tube amplifier in excellent working and looking conditions for sale. Please note that this is an old Jolida 502B without remote control
I am the original owner and purchased the amp from an authorized dealer in 2003. Then I send it to response audio for a custom modification that resulted in significant improvement of sound quality. The modification including Bybee quantum purifiers in the B+ voltage, resistor/capacitor/RCA input with better quality, new carbon volume control pot/subwoofer output/tape loop output and others. In addition, the balance control is bypassed. The following tubes are including in the sale: 4X Electro-Harmonix KT88, 2X GE NOS 5751 (1960-1961), 2X Electro-Harmonix 12AX7, 2X Sylvania NOS 12AX7, 2X Mullard NOS 12AT7. The tube alone is worth more than 300 USD. The reason of selling is due to recent upgrade to a speakers that demand higher power than the the Jolida can deliver.
I lost the receipt from the response audio for the modification works and this is the reason of the low asking price. However, MY ASKING PRICE IS FAIR AND FIRM. Therefore, PLEASE DO NOT EMAIL ME FOR THE BEST OFFERING PRICE. I only deal with audiogoner with good feedback due to many bad experiences working with new and zero feedback audiogon member who failed to complete the transactions.
PS: I cannot upload the pictures to the audiogon website. Please send me your email so I can send the picture to you.
Buyer is responsible for the paypal fee and shipping. Thanks!