When I got my mini amp kit the resistor was missing. It took a day or two of emails to get a replacement mailed. The mail was delayed and was delivered several days after the estimated delivery date. Had there been documentation on the type of resistor I could have bought one myself.
Response from Tymkrs (The Toymakers) | Aug. 6, 2017
Our apologies for the resistor being missing - the QC folks have been appropriately notified. The datasheets are all available at http://tymkrs.com/products.html and there is a direct link on the page it is being sold on labeled "Documentation". We hope though that the amplifier works as intended!